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TUX/TDX - Flashing Code 2
Trane Gas Furnace: TUX/TDX Re: No Heat - Code 2 Code 2 = 3 Failed Ignition Attempts Qty Possible Causes: 1 Bad Glow Plug Dirty Flame Sensor Clogged Burners No or Low Gas Pressure Bad Gas Valve Bad Control Board Chattering...
24 Nov, 2025
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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: ...
18 Nov, 2025
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TUH/TDH - Flashing Code 2
Trane Gas Furnace: TUH/TDH Re: No Heat - Code 2 Code 2 = 3 Failed Ignition Attempts Qty Possible Causes: 1 Bad Glow Plug Dirty Flame Sensor Clogged Burners No or Low Gas Pressure Bad Gas Valve Bad Ignition Control ...
18 Nov, 2025
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TUD/TDD - Flashing Code 2
Trane Gas Furnace: TUD/TDD Re: No Heat - Code 2 Code 2 = 3 Failed Ignition Attempts Qty Possible Causes: 1 Bad Glow Plug Dirty Flame Sensor Clogged Burners No or Low Gas Pressure Bad Gas Valve Bad Ignition Control ...
18 Nov, 2025
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T755 Configuration
PRO1 Thermostat: T755 Re: Installer Setup Options To enter Installer Setup: Press the "MENU" button. Press and hold the "TECH SETUP" button for 3 seconds. Use the PREV and NEXT keys to move between setup items. Use the + and - key to change options. Press the "DONE" key to exit. ...
17 Nov, 2025
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TUD/TDD - Flashing Code 4
Trane Gas Furnace: TUD/TDD Re: Flashing Code 4 Code 4 = Limit switch open There are 4 limits wired in series: a Reversed Flow Limit in the blower compartment (auto-reset), two Roll-Out Limits (manual-reset), and a Primary Limit (auto-reset). Qty Possible Causes: Bad Blower...
17 Nov, 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. ...
28 Oct, 2025
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PHU - Flashing Code 8
York Gas Furnace: PHU Re: No Heat - Code 8 Code 8 = Flame Lost 5 Times During a Heat Cysle Qty Possible Causes: 2 Dirty Flame Sensor Clogged Burners 2 Chattering Pressure Switch No or Low Gas Pressure Combustion Air Problem ...
28 Oct, 2025
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YHE/YHG - Code 3 - High Pressure - Heating
York YHE / YHG Heat Pump: Heating Re: High Pressure Fault - Last Mode Heat Pump The heat pump was running in normal heat mode (not in defrost) and the high pressure switch tripped. A High Pressure Lockout is indicated by a 3-Flash LED pattern on the outdoor unit control board. Qty ...
23 Oct, 2025
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DNZ - Flashing Code 2
Package Unit: DNZ Re: Flashing Code 2 These units have one control board (EMCB) which controls all unit functions. ► Any heating diagnostics will be displayed on the EMCB. CODE 2 = Pressure switch "Open" with the inducer motor energized. Qty Possible Causes: 1 Bad Inducer...
23 Oct, 2025
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P1XU - Flashing Code 7
York Gas Furnace: P1XU Re: No Heat - Flashing Code 7 (Assuming original control board) Code 7 = Failure to Sense Flame Qty Possible Causes: 1 Dirty Flame Sensor 1 Bad Glow Plug 1 Clogged Burners 1 Bad Gas Valve Intake Problem No or...
16 Oct, 2025
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Climatemaster - Code 2 / High Pressure Fault - Cooling
Climatemaster Geothermal: TE Re: Code 2 / High Pressure Fault - Cooling Code 2 = High Pressure Fault When the high pressure switch opens due to high refrigerant pressures the compressor relay is de-energized immediately since the high pressure switch is in series with the compressor contactor...
29 Sep, 2025
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Gas Furnace - Check Flame Sensor
Gas Furnace Re: Check Flame Sensor If the furnace is running, de-energize the call for heat and allow the furnace to cool. Turn off power to the furnace. Remove the wire that plugs into the flame sensor. On some models the flame sensor lead is hard-wired to the flame sensor, which...
2 Sep, 2025
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YHE/YHG - Code 3 - High Pressure - Cooling
York YHE / YHG Heat Pump: Cooling Re: High Pressure Fault - Last Mode Heat Pump The heat pump was running in cooling mode and the high pressure switch tripped. A High Pressure Lockout is indicated by a 3-Flash LED pattern on the outdoor unit control board. X/L Output Qty Possible...
12 May, 2025
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YH2F - Code 2 or 3 - High Pressure - Cooling
York Heat Pump: YH2F Re: High Pressure - Code 2 or Code 3 (Cooling) CODE 2 = High Pressure Switch Fault (Not in Lockout) CODE 3 = High Pressure Lockout (Multiple High Pressure Switch Faults) Qty Possible Causes: Excess Refrigerant Charge 2 Bad O/D Fan Motor ...
7 May, 2025
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NUGK - Burners Won't Ignite
Heil Gas Furnace: NUGK Re: Burners Won't Ignite These furnaces use a Honeywell spark ignition control and universal electronic ignition (3-wire) gas valve. When the ignition control receives 24VAC on "TH" or "25V" it should start sparking through the ignition cable and send power out "PV" to...
8 Apr, 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 limit switch has not closed within five minutes, the control will assume...
21 Mar, 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. This gas furnace has two pressure...
21 Mar, 2025
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58MXA - Flashing Code 13/Fault Code 13
Carrier Gas Furnace: 58MXA Re: Flashing Code 13 / Fault Code 13 Code 13 =Limit or Flame Roll-Out Lockout Diagnostic Light Sequence: 1-Short Flash, 3-Long Flashes (- , — — — ) ► A Code 13 is generated when the limit circuit has been open for more than 3 minutes. ► Auto-Resets after 3...
28 Feb, 2025
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Yorkguard VI - Low Discharge Temperature (Heating)
York Heat Pump: Yorkguard VI Re: Low Discharge Temperature (Heating) The status lights on the module will indicate as follows: Red = On, Green = 6 Flash. If, after energizing the compressor contactor for 1 hour, the Yorkguard module senses a compressor discharge temperature lower than 90...
28 Feb, 2025
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Sanyo - Technical Support
Sanyo Variable Refrigerant Flow Re: Technical Support Sanyo was bought by Panasonic. For Technical Assistance / Support: PH: 800-851-1235
27 Feb, 2025
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TM9X/TM9E - Flashing Code 3
York Gas Furnace: TM9X/TM9E Re: Flashing Code 3 Code 3 = Furnace Pressure Switch failed to close on a call for heat. This gas furnace has two pressure switches (PS1 & PS2) - a higher pressure switch to monitor the negative pressure at the inducer motor, and a lower pressure switch to...
18 Feb, 2025
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TM9Y - Flashing Code 3
York Gas Furnace: TM9Y Re: Flashing Code 3 Code 3 = The normally open (PS1 or PS3) pressure switch contact did not close after the inducer was energized. ► This is a "Soft Lockout" which will automatically reset after 1 hour. ► There are 3 pressure switches on this furnace. PS1 (1st Stage...
18 Feb, 2025
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TG9S/GY9S - Flashing Code 6
York Gas Furnace: TG9S/GY9S Re: Flashing Code 6 Code 6 = Pressure switch opened (Code 3) 4 times during a run cycle. ► This is a "Soft Lockout" which will automatically reset after 1 hour. Qty Possible Causes: 3 Water in Inducer 1 Improper Condensate Drainage 1 ...
18 Feb, 2025
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TM9X/TM9E - Diagnostic Codes
York Gas Furnaces: TM9X/TM9E Re: Diagnostic Codes / Fault Codes These York gas furnaces have a control board inside the furnace blower compartment that will flash a diagnostic code that shows the operating status of the furnace. !! Do Not go by the Fault Descriptions on the blower door -...
14 Feb, 2025
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