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Trane and American Standard Furnace Error Codes

Trane and American Standard gas furnaces share platforms. The control board LED blinks a set number of times to report a fault, visible through the blower door window. Below are 31 Trane and American Standard codes across 4 model series. Each one says what it means, which series it applies to, what you can safely check, and when to call a licensed pro, with a link to the Trane and American Standard document it comes from.

The same code can mean different things on different series, so match the series column to your unit. Your unit's manual is the final word. Reviewed October 2026.

🔎 Enter the code, blink count or model shown on your unit

39 codes

All Trane and American Standard error codes

Code	Meaning	Applies to	Safety
2 flashes Red LED on the integrated furnace control blinks 2 times, then pauses	System lockout, retries or recycles exceeded	Trane and American Standard single-stage furnaces serviced with the SiNi igniter control kit (UH1, DH1, UD1, DD1 families and M951)	🧭 Check first
2 flashes Red fault LED on the integrated furnace control blinks 2 times	Flame lost or ignition failure	Trane and American Standard modulating communicating UHM/DHM furnaces (e.g. UHMB060ACV3VB, UHMC100ACV4VB, *UHMD120ACV5VB and matching DHM models)	🧭 Check first
3 flashes Red LED on the integrated furnace control blinks 3 times, then pauses	Pressure switch fault	Trane and American Standard single-stage furnaces serviced with the SiNi igniter control kit (UH1, DH1, UD1, DD1 families and M951)	🛑 Call a pro
3 flashes Red fault LED on the integrated furnace control blinks 3 times	Pressure switch failure	Trane and American Standard modulating communicating UHM/DHM furnaces (e.g. UHMB060ACV3VB, UHMC100ACV4VB, *UHMD120ACV5VB and matching DHM models)	🛑 Call a pro
4 flashes Red LED on the integrated furnace control blinks 4 times, then pauses	Open limit switch	Trane and American Standard single-stage furnaces serviced with the SiNi igniter control kit (UH1, DH1, UD1, DD1 families and M951)	🧭 Check first
4 flashes Red fault LED on the integrated furnace control blinks 4 times	High temperature limit fault	Trane and American Standard modulating communicating UHM/DHM furnaces (e.g. UHMB060ACV3VB, UHMC100ACV4VB, *UHMD120ACV5VB and matching DHM models)	🧭 Check first
5 flashes Red LED on the integrated furnace control blinks 5 times, then pauses	Flame sensed when none should be present	Trane and American Standard single-stage furnaces serviced with the SiNi igniter control kit (UH1, DH1, UD1, DD1 families and M951)	🛑 Call a pro
5 flashes Red fault LED on the integrated furnace control blinks 5 times	Flame detected when it should not be	Trane and American Standard modulating communicating UHM/DHM furnaces (e.g. UHMB060ACV3VB, UHMC100ACV4VB, *UHMD120ACV5VB and matching DHM models)	🛑 Call a pro
6 flashes Red LED on the integrated furnace control blinks 6 times, then pauses	115 volt power reversed or improper ground	Trane and American Standard single-stage furnaces serviced with the SiNi igniter control kit (UH1, DH1, UD1, DD1 families and M951)	🛑 Call a pro
6 flashes Red fault LED on the integrated furnace control blinks 6 times	Line polarity, ground or igniter fault	Trane and American Standard modulating communicating UHM/DHM furnaces (e.g. UHMB060ACV3VB, UHMC100ACV4VB, *UHMD120ACV5VB and matching DHM models)	🛑 Call a pro
7 flashes Red LED on the integrated furnace control blinks 7 times, then pauses	Gas valve circuit error	Trane and American Standard single-stage furnaces serviced with the SiNi igniter control kit (UH1, DH1, UD1, DD1 families and M951)	🛑 Call a pro
7 flashes Red fault LED on the integrated furnace control blinks 7 times	Gas valve fault	Trane and American Standard modulating communicating UHM/DHM furnaces (e.g. UHMB060ACV3VB, UHMC100ACV4VB, *UHMD120ACV5VB and matching DHM models)	🛑 Call a pro
8 flashes Red LED on the integrated furnace control blinks 8 times, then pauses	Low flame sense signal	Trane and American Standard single-stage furnaces serviced with the SiNi igniter control kit (UH1, DH1, UD1, DD1 families and M951)	🛑 Call a pro
8 flashes Red fault LED on the integrated furnace control blinks 8 times	Low flame signal	Trane and American Standard modulating communicating UHM/DHM furnaces (e.g. UHMB060ACV3VB, UHMC100ACV4VB, *UHMD120ACV5VB and matching DHM models)	🧭 Check first
9 flashes Red LED on the integrated furnace control blinks 9 times, then pauses	Igniter relay fault	Trane and American Standard single-stage furnaces serviced with the SiNi igniter control kit (UH1, DH1, UD1, DD1 families and M951)	🛑 Call a pro
9 flashes Red fault LED on the integrated furnace control blinks 9 times	Flue gas temperature too high	Trane and American Standard modulating communicating UHM/DHM furnaces (e.g. UHMB060ACV3VB, UHMC100ACV4VB, *UHMD120ACV5VB and matching DHM models)	🧭 Check first
10 flashes Red fault LED on the integrated furnace control blinks 10 times	Communication fault	Trane and American Standard modulating communicating UHM/DHM furnaces (e.g. UHMB060ACV3VB, UHMC100ACV4VB, *UHMD120ACV5VB and matching DHM models)	🧭 Check first
E2.1 Shown on the 7-segment display of the integrated furnace control	Retry exceeded (flame never sensed)	Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces	🧭 Check first
E2.2 Shown on the 7-segment display of the integrated furnace control	Recycles exceeded (flame lost)	Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces	🧭 Check first
E3.1 Shown on the 7-segment display of the integrated furnace control	Shorted pressure switch, 1st stage	Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces	🛑 Call a pro
E3.2 Shown on the 7-segment display of the integrated furnace control	Open pressure switch, 1st stage	Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces	🛑 Call a pro
E3.4 Shown on the 7-segment display of the integrated furnace control	Open pressure switch, 2nd stage	Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces	🛑 Call a pro
E04 Shown on the 7-segment display of the integrated furnace control	Open limit	Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces	🧭 Check first
E05 Shown on the 7-segment display of the integrated furnace control	Flame detected, should not be present	Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces	🛑 Call a pro
E6.1 Shown on the 7-segment display of the integrated furnace control	Voltage reversed polarity	Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces	🛑 Call a pro
E6.2 Shown on the 7-segment display of the integrated furnace control	Bad grounding	Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces	🛑 Call a pro
E6.3 Shown on the 7-segment display of the integrated furnace control	Igniter relay fails or igniter open	Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces	🛑 Call a pro
E08 Shown on the 7-segment display of the integrated furnace control	Low flame current	Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces	🧭 Check first
E12 Shown on the 7-segment display of the integrated furnace control	Open fuse	Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces	🛑 Call a pro
E1 Error code on the control display, with the red diagnostic LED blinking	Shorted pressure switch	Trane and American Standard A801X high efficiency gas furnaces (A801X060AM3S and related models)	🛑 Call a pro
E2 Error code on the control display, with the red diagnostic LED blinking	Open pressure switch	Trane and American Standard A801X high efficiency gas furnaces (A801X060AM3S and related models)	🛑 Call a pro
E5 Error code on the control display, with the red diagnostic LED blinking	Open thermal limit or rollout switch	Trane and American Standard A801X high efficiency gas furnaces (A801X060AM3S and related models)	🧭 Check first
E6 Error code on the control display, with the red diagnostic LED blinking	Open limit or rollout (after 5 times)	Trane and American Standard A801X high efficiency gas furnaces (A801X060AM3S and related models)	🛑 Call a pro
E7 Error code on the control display, with the red diagnostic LED blinking	Ignition failure, locked out	Trane and American Standard A801X high efficiency gas furnaces (A801X060AM3S and related models)	🧭 Check first
E8 Error code on the control display, with the red diagnostic LED blinking	Flame loss, locked out	Trane and American Standard A801X high efficiency gas furnaces (A801X060AM3S and related models)	🧭 Check first
FL Error code on the control display, with the red diagnostic LED blinking	Flame low	Trane and American Standard A801X high efficiency gas furnaces (A801X060AM3S and related models)	🧭 Check first
FE Error code on the control display, with the red diagnostic LED blinking	Gas valve relay stuck closed	Trane and American Standard A801X high efficiency gas furnaces (A801X060AM3S and related models)	🛑 Call a pro
Pr Error code on the control display, with the red diagnostic LED blinking	Power reversed	Trane and American Standard A801X high efficiency gas furnaces (A801X060AM3S and related models)	🛑 Call a pro
Fo Error code on the control display, with the red diagnostic LED blinking	Fuse open	Trane and American Standard A801X high efficiency gas furnaces (A801X060AM3S and related models)	🛑 Call a pro

✅ Usually fine to keep running · 🧭 Check a few things first · 🛑 Turn it off and call a licensed pro

Find your Trane and American Standard model series

The codes Trane and American Standard documents for each series we have checked. If your series is not listed, the code may mean something different on your unit, so check its manual.

Trane and American Standard A801X high efficiency gas furnaces (A801X060AM3S and related models)

E1 E2 E5 E6 E7 E8 FL FE Pr Fo

Trane and American Standard modulating communicating UHM/DHM furnaces (e.g. UHMB060ACV3VB, UHMC100ACV4VB, *UHMD120ACV5VB and matching DHM models)

2 flashes 3 flashes 4 flashes 5 flashes 6 flashes 7 flashes 8 flashes 9 flashes 10 flashes

Trane and American Standard single-stage furnaces serviced with the SiNi igniter control kit (UH1, DH1, UD1, DD1 families and M951)

2 flashes 3 flashes 4 flashes 5 flashes 6 flashes 7 flashes 8 flashes 9 flashes

Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces

E2.1 E2.2 E3.1 E3.2 E3.4 E04 E05 E6.1 E6.2 E6.3 E08 E12

More Trane and American Standard codes

Trane and American Standard 5 flashes: Flame sensed when none should be present

🛑 Turn it off and call a licensed pro

Applies to: Trane and American Standard single-stage furnaces serviced with the SiNi igniter control kit (*UH1, *DH1, *UD1, *DD1 families and M951). Shows as: Red LED on the integrated furnace control blinks 5 times, then pauses

The control senses flame when no flame should be present.

When to call a pro: Call a licensed HVAC technician right away.

Source: Trane Service Installer's Guide 18-CH93D1-1A-EN (Jul 2020), Integrated Furnace Control Diagnostic Codes

🛑 Turn it off and call a licensed pro

Applies to: Trane and American Standard modulating communicating *UHM/*DHM furnaces (e.g. *UHMB060ACV3VB, *UHMC100ACV4VB, *UHMD120ACV5VB and matching DHM models). Shows as: Red fault LED on the integrated furnace control blinks 5 times

The control detects flame when it should not be present.

When to call a pro: Call a licensed HVAC technician right away.

Source: Trane Installer's Guide 18-CD30D1-20-EN (06/2020), Table 24 Furnace Alert Codes, p.55

Trane and American Standard 6 flashes: 115 volt power reversed or improper ground

🛑 Turn it off and call a licensed pro

The control reports 115 volt AC power is reversed or the furnace has an improper ground. This is a wiring fault.

When to call a pro: Call a licensed HVAC technician. Line voltage wiring and grounding must be fixed by a professional.

Source: Trane Service Installer's Guide 18-CH93D1-1A-EN (Jul 2020), Integrated Furnace Control Diagnostic Codes

🛑 Turn it off and call a licensed pro

This flash count covers reversed voltage polarity, a missing earth ground, or an igniter or triac fault.

When to call a pro: Call a licensed HVAC technician. Wiring, grounding and igniter faults need professional repair.

Source: Trane Installer's Guide 18-CD30D1-20-EN (06/2020), Table 24 Furnace Alert Codes, p.55

Trane and American Standard 7 flashes: Gas valve circuit error

🛑 Turn it off and call a licensed pro

The control reports a gas valve circuit error.

When to call a pro: Call a licensed HVAC technician to inspect the gas valve circuit.

Source: Trane Service Installer's Guide 18-CH93D1-1A-EN (Jul 2020), Integrated Furnace Control Diagnostic Codes

🛑 Turn it off and call a licensed pro

The control either senses 24V at the gas valve when it should not be there, or tried to turn the valve on and did not sense 24V.

When to call a pro: Call a licensed HVAC technician to inspect the gas valve circuit.

Source: Trane Installer's Guide 18-CD30D1-20-EN (06/2020), Table 24 Furnace Alert Codes, p.55

Trane and American Standard 8 flashes: Low flame sense signal

🛑 Turn it off and call a licensed pro

The control reports a low flame sense signal.

When to call a pro: Call a licensed HVAC technician. Flame sensor service and grounding checks are for a professional.

Source: Trane Service Installer's Guide 18-CH93D1-1A-EN (Jul 2020), Integrated Furnace Control Diagnostic Codes

🧭 Check a few things first

Flame current is low, but still strong enough to allow operation.

When to call a pro: Call a licensed HVAC technician. A flame sensor must be serviced by a professional.

Source: Trane Installer's Guide 18-CD30D1-20-EN (06/2020), Table 24 Furnace Alert Codes, p.55

Trane and American Standard 9 flashes: Igniter relay fault

🛑 Turn it off and call a licensed pro

The control reports an igniter relay fault.

When to call a pro: Call a licensed HVAC technician to test the igniter circuit and control.

Source: Trane Service Installer's Guide 18-CH93D1-1A-EN (Jul 2020), Integrated Furnace Control Diagnostic Codes

🧭 Check a few things first

The flue gas temperature is too high. The manual says this could be caused by low airflow or fan failure.

When to call a pro: Call a licensed HVAC technician if it repeats.

Source: Trane Installer's Guide 18-CD30D1-20-EN (06/2020), Table 24 Furnace Alert Codes, p.55

Trane and American Standard 10 flashes: Communication fault

🧭 Check a few things first

This group covers communication problems between the control, inducer motor, blower motor and system, including loss of heat or cool demand.

When to call a pro: Call a licensed HVAC technician if the furnace and thermostat will not communicate.

Source: Trane Installer's Guide 18-CD30D1-20-EN (06/2020), Table 24 Furnace Alert Codes, p.55

Trane and American Standard E2.2: Recycles exceeded (flame lost)

🧭 Check a few things first

Applies to: Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces. Shows as: Shown on the 7-segment display of the integrated furnace control

Flame was sensed and then lost. The control locks out for one hour after 10 times.

When to call a pro: Call a licensed HVAC technician if it locks out again.

Source: Trane Installer's Guide 18-CE14D1-1A-EN (04/2020), Integrated Furnace Control Display Codes, p.58

Trane and American Standard E3.1: Shorted pressure switch, 1st stage

🛑 Turn it off and call a licensed pro

Applies to: Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces. Shows as: Shown on the 7-segment display of the integrated furnace control

The first stage pressure switch is shorted.

When to call a pro: Call a licensed HVAC technician to test the pressure switch and inducer.

Source: Trane Installer's Guide 18-CE14D1-1A-EN (04/2020), Integrated Furnace Control Display Codes, p.58

Trane and American Standard E3.4: Open pressure switch, 2nd stage

🛑 Turn it off and call a licensed pro

Applies to: Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces. Shows as: Shown on the 7-segment display of the integrated furnace control

The second stage pressure switch is open. This applies to the S8X2 only.

When to call a pro: Call a licensed HVAC technician.

Source: Trane Installer's Guide 18-CE14D1-1A-EN (04/2020), Integrated Furnace Control Display Codes, p.58

Trane and American Standard E05: Flame detected, should not be present

🛑 Turn it off and call a licensed pro

Applies to: Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces. Shows as: Shown on the 7-segment display of the integrated furnace control

The control senses flame when none should be present.

When to call a pro: Call a licensed HVAC technician right away.

Source: Trane Installer's Guide 18-CE14D1-1A-EN (04/2020), Integrated Furnace Control Display Codes, p.58

Trane and American Standard E6.1: Voltage reversed polarity

🛑 Turn it off and call a licensed pro

Applies to: Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces. Shows as: Shown on the 7-segment display of the integrated furnace control

The control reports reversed voltage polarity.

When to call a pro: Call a licensed HVAC technician to correct the wiring.

Source: Trane Installer's Guide 18-CE14D1-1A-EN (04/2020), Integrated Furnace Control Display Codes, p.58

Trane and American Standard E6.2: Bad grounding

🛑 Turn it off and call a licensed pro

Applies to: Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces. Shows as: Shown on the 7-segment display of the integrated furnace control

The control reports bad grounding.

When to call a pro: Call a licensed HVAC technician to correct the grounding.

Source: Trane Installer's Guide 18-CE14D1-1A-EN (04/2020), Integrated Furnace Control Display Codes, p.58

Trane and American Standard E6.3: Igniter relay fails or igniter open

🛑 Turn it off and call a licensed pro

Applies to: Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces. Shows as: Shown on the 7-segment display of the integrated furnace control

The control reports either the igniter relay failing or the igniter being open.

When to call a pro: Call a licensed HVAC technician to test the igniter.

Source: Trane Installer's Guide 18-CE14D1-1A-EN (04/2020), Integrated Furnace Control Display Codes, p.58

Trane and American Standard E08: Low flame current

🧭 Check a few things first

Applies to: Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces. Shows as: Shown on the 7-segment display of the integrated furnace control

Flame current is low, but still strong enough to allow operation.

When to call a pro: Call a licensed HVAC technician. Flame sensor service is for a professional.

Source: Trane Installer's Guide 18-CE14D1-1A-EN (04/2020), Integrated Furnace Control Display Codes, p.58

Trane and American Standard E12: Open fuse

🛑 Turn it off and call a licensed pro

Applies to: Trane S8B1 and S8X1 (single stage) and S8X2 (two stage) gas furnaces. Shows as: Shown on the 7-segment display of the integrated furnace control

The control reports an open fuse.

When to call a pro: Call a licensed HVAC technician to find the cause. Do not fit a larger fuse.

Source: Trane Installer's Guide 18-CE14D1-1A-EN (04/2020), Integrated Furnace Control Display Codes, p.58

Trane and American Standard E1: Shorted pressure switch

🛑 Turn it off and call a licensed pro

Applies to: Trane and American Standard A801X high efficiency gas furnaces (A801X060AM3S and related models). Shows as: Error code on the control display, with the red diagnostic LED blinking

The pressure switch is stuck closed. The manual says to check the switch function and verify the inducer is turning off.

When to call a pro: Call a licensed HVAC technician.

Source: Trane Installation Manual 88-A801X004-1B-EN (11/2024), Table 13-1 Troubleshooting Chart, p.32

Trane and American Standard E2: Open pressure switch

🛑 Turn it off and call a licensed pro

Applies to: Trane and American Standard A801X high efficiency gas furnaces (A801X060AM3S and related models). Shows as: Error code on the control display, with the red diagnostic LED blinking

The pressure switch is open. The manual says to check the switch function and tubing, and verify the inducer is pulling enough vacuum to engage the switch.

When to call a pro: Call a licensed HVAC technician for pressure switch and inducer checks.

Source: Trane Installation Manual 88-A801X004-1B-EN (11/2024), Table 13-1 Troubleshooting Chart, p.32

Trane and American Standard E6: Open limit or rollout (after 5 times)

🛑 Turn it off and call a licensed pro

Applies to: Trane and American Standard A801X high efficiency gas furnaces (A801X060AM3S and related models). Shows as: Error code on the control display, with the red diagnostic LED blinking

A thermal limit or rollout switch opened repeatedly (after 5 times).

When to call a pro: Call a licensed HVAC technician.

Source: Trane Installation Manual 88-A801X004-1B-EN (11/2024), Table 13-1 Troubleshooting Chart, p.32

Trane and American Standard E8: Flame loss, locked out

🧭 Check a few things first

Applies to: Trane and American Standard A801X high efficiency gas furnaces (A801X060AM3S and related models). Shows as: Error code on the control display, with the red diagnostic LED blinking

Flame was lost repeatedly and the control locked out.

When to call a pro: Call a licensed HVAC technician.

Source: Trane Installation Manual 88-A801X004-1B-EN (11/2024), Table 13-1 Troubleshooting Chart, p.32

Trane and American Standard FL: Flame low

🧭 Check a few things first

Applies to: Trane and American Standard A801X high efficiency gas furnaces (A801X060AM3S and related models). Shows as: Error code on the control display, with the red diagnostic LED blinking

The flame sense current is low. The manual lists carbon on the flame sensor, poor grounding or a misaligned sensor as causes.

When to call a pro: Call a licensed HVAC technician to service the flame sensor.

Source: Trane Installation Manual 88-A801X004-1B-EN (11/2024), Table 13-1 Troubleshooting Chart, p.32

Trane and American Standard FE: Gas valve relay stuck closed

🛑 Turn it off and call a licensed pro

Applies to: Trane and American Standard A801X high efficiency gas furnaces (A801X060AM3S and related models). Shows as: Error code on the control display, with the red diagnostic LED blinking

The gas valve relay is stuck closed. The manual says to verify the gas valve operates and shuts down properly.

When to call a pro: Call a licensed HVAC technician right away.

Source: Trane Installation Manual 88-A801X004-1B-EN (11/2024), Table 13-1 Troubleshooting Chart, p.32

Trane and American Standard Pr: Power reversed

🛑 Turn it off and call a licensed pro

Applies to: Trane and American Standard A801X high efficiency gas furnaces (A801X060AM3S and related models). Shows as: Error code on the control display, with the red diagnostic LED blinking

Power polarity is reversed. The manual says to verify the control and furnace are properly grounded and reverse polarity if incorrect.

When to call a pro: Call a licensed HVAC technician.

Source: Trane Installation Manual 88-A801X004-1B-EN (11/2024), Table 13-1 Troubleshooting Chart, p.32

Trane and American Standard Fo: Fuse open

🛑 Turn it off and call a licensed pro

Applies to: Trane and American Standard A801X high efficiency gas furnaces (A801X060AM3S and related models). Shows as: Error code on the control display, with the red diagnostic LED blinking

The low voltage fuse is open, indicating a low voltage over-current condition. The manual says to locate the shorted wiring or component.

When to call a pro: Call a licensed HVAC technician to find the short.

Source: Trane Installation Manual 88-A801X004-1B-EN (11/2024), Table 13-1 Troubleshooting Chart, p.32

Safe first steps for any code

Count the LED flashes through the blower door window before you switch anything off. Cutting power can clear the code.
Replace or clean the furnace air filter.
Check the thermostat: correct mode, set above room temperature, and fresh batteries.
Make sure the furnace power switch and breaker are on. If the furnace has locked out, turning the power off and back on once restarts it.
Make sure the gas valve is in the ON position, following the lighting instructions on the furnace label only.
On high-efficiency furnaces, look at the outside vent and intake pipes for snow, ice, leaves or nests (look only, do not take pipes apart).

🛑 Stop and call a licensed pro if

You smell gas. Leave the house, do not touch switches, and call your gas utility from outside.
Flame rollout, limit or pressure switch codes that come back after one reset.
Anything involving the control board, gas valve, flame sensor, igniter or venting.
A carbon monoxide alarm sounds. Get everyone outside and call 911 or the fire department.

Shaun Cain · Certified HVAC & Refrigeration Technician · Ask an HVAC technician

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