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TUH/TDH - Flashing Code 3
Trane Gas Furnace: TUH1/TDH1 Re: Flashing Code 3 Code 3 = Pressure switch fault ► This furnace uses a dual-hose (differential pressure) pressure switch. You need to monitor both hoses at the same time to see actual working pressure. A Code 3 will result from either of the following conditions: ...
29 Dec, 2025
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G6R - Flashing Code 4
Nordyne Gas Furnace: G6RC/FG6RC Re: No Heat - Flashing Code 4 Code 4 = Three consecutive failed ignition attempts (failed to sense flame). Qty Possible Causes: Dirty Flame Sensor 3 Bad Glow Plug Clogged Burners No or Low Gas Pressure 1 Bad...
29 Dec, 2025
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N95ES Fault Codes/Diagnostic Codes
Heil N95ES Gas Furnaces Re: Lockout Codes / Diagnostic Codes Each of the following status codes is a Single or 2-digit number. ► The first digit is determined by the number of SHORT flashes and the second digit is determined by the number of LONG flashes. ► For Example: 1-Short Flash,...
24 Dec, 2025
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PG3 - Status/Diagnostic Codes
York Package Unit: PG3 Re: Status Codes / Diagnostic Codes These York package units have a control board inside the unit control compartment that will flash a diagnostic code that shows the operating status of the unit. Status/Diagnostic Codes Status LED A2L LED Condition ...
24 Dec, 2025
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G6RC - Flashing Code 1
Nordyne Gas Furnace: G6RC Re: Flashing Code 1 Code 1 = Limit switch open If the limit control opens, the burners will be de-energized and the air circulation and vent blower will be turned on until the limit closes. The diagnostic light code for this is one short flash followed by a pause. ...
23 Dec, 2025
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TG9S/GY9S - Flashing Code 4
York Gas Furnace: TG9S/GY9S Re: Flashing Code 4 Code 4 = Limit switch open If the limit control opens, the burners will be de-energized and the air circulation and vent blower will be turned on until the limit closes. The diagnostic light code for this is four short flashes followed by a...
23 Dec, 2025
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58MXA - Flashing Code 14/Fault Code 14
Carrier 90% Gas Furnace: 58MXA Re: Flashing Code 14 / Fault Code 14 Code 14 = Four Failed Ignition Attempts Diagnostic Light Sequence: 1-Short Flash, 4-Long Flashes (- , — — — —) ► Very Important! If the inducer motor is off during lockout, this indicates that flame failed to establish 4...
22 Dec, 2025
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FocusPro N100 - TH1110U Setup Options
Honeywell Thermostat: TH5220D FocusPro Re: Installer Setup Options To enter Installer Setup, press and hold the "Fan" button and the "Up" button together until the display changes. ISU# ISU Name ISU Options (factory defaults are bold) 1050 ...
17 Dec, 2025
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GMH95 / GCH9 - Flashing Code 1
Goodman Gas Furnace: GMH95 / GCH9 Re: Flashing Code 1 / Won't Ignite Code 1 = 3 Failed Ignition Attempts ► ** Be aware that the furnace Condensate Pressure Switch breaks 24V power to the gas valve and will cause a Fault Code 1 (Does not cause a Code 3). ** ► The manufacturer's literature does...
17 Dec, 2025
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YHJF - Defrost Problem/Outdoor Coil Frozen
York Heat Pump: YHJF24 - 48 Re: Not Defrosting / Frozen The YHJF 2 to 4 Ton models use a Demand Defrost control board (the 5 Ton model uses a Yorkguard VI) The defrost board uses an Ambient (outdoor) Sensor and Liquid Line Sensor to determine the proper conditions for defrost to occur. ...
17 Dec, 2025
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Y91E - Flashing Code 4
York Gas Furnace: Y91E Re: Flashing Code 4 Code 4 = Main limit switch has opened its normally closed contacts. The control will operate the supply air blower and inducer while the open limit condition exists. ► If the main limit switch opens Five Times within a single call for heat, the...
16 Dec, 2025
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GM9S96 - FLASHING EE0
Goodman Gas Furnace: GM9S96 Re: Flashing Code EE0/ Won't Ignite EE0 = 3 Failed Ignition Attempts ► Be aware that the furnace Condensate Pressure Switch (Front Cover Pressure Switch) breaks power to the gas valve and will cause an EE0 Code (Does not cause a pressure switch code). Qty...
16 Dec, 2025
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Goodman GMP - Code 4
Goodman Gas Furnace: GMP Re: Flashing Code 4 (Assuming original control board) If the limit control opens, the burners will be de-energized and the air circulation and vent blower will be turned on until the limit closes. The diagnostic light code for this is four short flashes followed by a...
15 Dec, 2025
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GM9S96 - Fault Codes
Goodman Gas Furnace: GM9S96 Re: Fault Codes This furnace uses a 3-segment display to show status and fault codes. All equipment errors will show a fault display starting with "E". EE0 3 Failures to Establish Flame No Gas Bad Ignitor Dirty Flame Sensor Clogged...
15 Dec, 2025
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GM9S96 - View & Clear Fault Codes
Goodman Gas Furnace: GM9S96 Re: View & Clear Fault Codes 1. To VIEW Fault Codes/History Press either the Left or Right switch until "L 6 F" is displayed. Press the center switch to view stored faults. 2. To CLEAR Fault Codes/History Press either the Left or Right switch until...
15 Dec, 2025
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GSZ14 - Defrost Problem, Outdoor Coil Frozen
Goodman Heat Pump: GSZ14 Re: Defrost Problem, Outdoor Coil Frozen The Goodman GSZ14 Heat Pump uses a Time & Temperature Defrost Board. ► There are two different defrost boards used on these models. PCBDM101 = Simple Time & Temperature Defrost Board PCBDM133S = Advanced Time...
4 Dec, 2025
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YM9M - Flashing Code 3
York 90% Gas Furnace: YM9M Re: Flashing Code 3 Code 3 = Furnace Pressure Switch failed to close on a call for heat. ►The code description on the blower door may say, "Vent or Termination Problem" which is a possible cause, but not the most likely. Qty Possible Causes: Bad...
4 Dec, 2025
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GMES96 Lockout Codes
Goodman Gas Furnace: GMES96 Re: Lockout Codes # of Flashes Description Off No Power or Faulty Control On Normal Operation 1 Ignition lockout (3 failed tries) - 1hr Auto Reset 2 Pressure switch stuck closed 3 Pressure switch stuck open 4 ...
3 Dec, 2025
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WSH - Defrost Problem / Outdoor Coil Frozen
Trane Rooftop Heat Pump: WSH Re: Not Defrosting / Frozen This model uses a Reliatel RTRM module to control defrost. The board uses an Ambient (outdoor) Sensor and Liquid Line Sensor to determine the proper conditions for defrost to occur. Qty Possible Causes: 1 Bad Liquid Line...
3 Dec, 2025
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PCG4 - Flashing Code 1
York package Unit: PCG4 Re: Flashing Code 1 Code 1 = Flame sensed with no call for heat. In a Code 1 situation, the furnace control board thinks that the gas valve is stuck on and the flame is still burning without a call for heat. Therefore, when a control board goes into a code 1, it will...
3 Dec, 2025
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PT9 - Flashing Code 9
York Gas Furnace: PT9 Re: Flashing Code 9 Code 9 = Indicates reversed line voltage polarity, reversed low voltage wiring, or Grounding problem Qty Possible Causes: 1 Loose Ground Missing Ground Reversed Line Voltage ("Hot" on white) Reversed Low...
3 Dec, 2025
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TM9T - Flashing Code 9
York Gas Furnace: TM9T Re: Flashing Code 9 Code 9 = Indicates reversed line voltage polarity, reversed low voltage wiring, or Grounding problem Qty Possible Causes: 1 Loose Ground Missing Ground Reversed Line Voltage ("Hot" on white) Reversed Low...
3 Dec, 2025
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PT9 - Flashing Code 8
York Gas Furnace: PT9 Re: No Heat - Flashing Code 8 Code 8 = Flame was established but then lost - 5 times. ► This is a Soft-Lockout which will automatically reset after 1 hour. Qty Possible Causes: Dirty Flame Sensor Clogged Burners No or Low Gas Pressure ...
3 Dec, 2025
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TM9T - Flashing Code 7
York Gas Furnace: TM9T Re: No Heat - Flashing Code 7 Code 7 = Indicates that the flame could not be established. This no-light condition occurred 3 times (2 retries) during the call for heat before locking out. ► The furnace will lock out for one hour and then attempt a restart. ...
3 Dec, 2025
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TM9T - Flashing Code 5
York Gas Furnace: TM9T Re: Flashing Code 5 Code 5 = Roll-out switch has opened its normally closed contacts or low voltage fuse blown. The control will operate the supply air blower and inducer while the open limit condition exists. ► The primary limit is wired in series with the roll-out...
3 Dec, 2025
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