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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. ...
20 Dec, 2024
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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...
19 Dec, 2024
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GMH95 / GCH9 - Flashing Code 3
Goodman Gas Furnace: GMH95 / GCH9 Re: Flashing Code 3 Code 3 = Pressure Switch failed to close with the inducer energized. ► There are 2 Pressure Switches in the furnace. Only the Inducer Pressure Switch will cause a Code 3. The Drain Pressure Switch (labeled as Front Cover Switch) breaks...
17 Dec, 2024
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P3DH - 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 (1LP & 2LP) - a higher pressure switch to monitor the negative pressure at the inducer motor, and a lower pressure switch to...
10 Dec, 2024
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Y91E Diagnostic Codes / Fault Codes
York Gas Furnaces: Y91E 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. Diagnostic Codes: Slow Green Normal Operation - no...
5 Dec, 2024
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PMPD - Flashing Code 3
York 90% Gas Furnace: P*MPD Re: Flashing Code 3 Code 3 = Furnace Pressure Switch failed to close on a call for heat. This gas furnace has a single pressure switch which monitors for proper venting. Qty Possible Causes: 1 Bad Inducer Motor 1 Bad Pressure Switch ...
29 Nov, 2024
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TM9X/TM9E - Flashing Code 4
York Gas Furnace: TM9X / TM9E 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...
21 Nov, 2024
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AHX/MX Air Handler - Flashing Code 6
York Air Handler: AHX / MX Re: Flashing Code 6 A Fault Code 6 results from the following sequence of conditions: If the limit switch opens for a long duration (Fault Code 4), the control will energize the blower until power is removed from the control (heat outputs will continue to cycle as...
20 Nov, 2024
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GMES96 - Flashing Code 3
Goodman Gas Furnace: GMES96 Re: Flashing Code 3 Code 3 = Pressure Switch failed to close with the inducer energized. ► There are 2 Pressure Switches in the furnace. Only the Inducer Pressure Switch will cause a Code 3. The Drain Pressure Switch (labeled as Front Cover Switch) breaks power to...
8 Nov, 2024
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GMES96 - Flashing Code 1
Goodman Gas Furnace: GMES96 Re: Flashing Code 1 / Won't Ignite Code 1 = 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 a Fault Code 1 (Does not cause a Code 3). Qty Possible...
8 Nov, 2024
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DNQ - V/S Motor Not Running - Heating
York Package Unit: DNQ Re: Variable Speed Blower Not Running - Heating The unit is calling for either Heating, but the indoor blower is not operating. Qty Possible Causes: 4 Bad Blower Motor/Controller Bad ECM Control Board Tripped Breaker Bad/Burnt...
25 Oct, 2024
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DNQ - V/S Motor Not Running - Cooling
York Package Unit: DNQ Re: Variable Speed Blower Not Running - Cooling The unit is calling for either Fan or Cooling, but the indoor blower is not operating. Qty Possible Causes: 4 Bad Blower Motor/Controller Bad ECM Control Board Tripped Breaker ...
25 Oct, 2024
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Troubleshooting V/S Blower Motor
York Package Unit: DNQ Re: Troubleshooting Variable Speed Blower Motor These package units use a 16-Pin Variable Speed Motor Control Module. Pin Designation 1 24V Common 2 W1 3 24V Common 4 DELAY Setting 5 COOL Setting 6 Y/Y1 7...
25 Oct, 2024
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Customer-Created Password
Honeywell Thermostat: TH8320R & TH8321R VisionPro Re: Customer-Created Password The customer has the option to create a new password. From the thermostat Home Screen press the Menu tab. Scroll down to highlight Security Settings and press Select. Scroll down to Create Password and...
25 Oct, 2024
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PCG4 - Flashing Code 7
York Package Gas/Electric: PCG4 Re: Flashing Code 7 Code 7 = Failure to Sense Flame (3 Failed Ignition Attempts) Qty Possible Causes: 1 Dirty Flame Sensor Bad Glow Plug 1 Clogged Burners 1 No or Low Gas Pressure 1 Bad Gas Valve Bad...
21 Oct, 2024
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P3UR - Flashing Code 3
York 90% Gas Furnace: P3UR Re: Flashing Code 3 Code 3 = Furnace Pressure Switch failed to close on a call for heat. Qty Possible Causes: 2 Bad Inducer Motor 1 Bad Pressure Switch 1 Clogged / Frozen Drain 1 Pressure Hose Problem 2 Item Stuck in...
16 Oct, 2024
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TG9S/GY9S - Flashing Code 3
York 90% Gas Furnace: TG9S Re: Flashing Code 3 Code 3 = Furnace Pressure Switch failed to close on a call for heat. ►The code description on the blower door says, "Vent or Termination Problem" which is a possible cause, but not the most likely. This gas furnace has two pressure switches: ...
14 Oct, 2024
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G24M3 Diagnostic Codes/Fault Codes
Lennox Gas Furnace: G24M3 Re: Diagnostic Codes / Lockout Codes There are 2 possible control boards on this furnace - a dual light board (Red & Green) and a single LED board. ORIGINAL BOARD Single-Light Furnace Control Board Fault Conditions LED Description ...
11 Oct, 2024
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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. ...
10 Oct, 2024
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York Air Handler: Flashing Code 4
York Air Handler: MP, MX, MV, AHP, AHX, AVY Re: Fan Runs Continuous, Flashing Code 4 Code 4 = Extended Limit Trip The control board in the air handler monitors the limit switch(es) in the aux heaters. If the limit switch opens for a long duration (fault code 4), the control will energize...
4 Oct, 2024
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Climatemaster - Flashing Code 6
ClimateMaster Heat Pump: Heating / Cooling Re: Code 6 Code 6 = Condensate Overflow The condensate overflow sensor must sense overflow level for 30 continuous seconds to be recognized as a CO fault. Condensate overflow will be monitored at all times. Qty Possible Causes: ...
20 Sep, 2024
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Heat Pump - High Head Pressure (Heating)
Heat Pump: Heating Re: High Discharge Pressure / High Head Pressure As the system runs in the heating mode, the discharge pressure exceeds the normal operating pressure. R22 System Normal Head Pressure = 175 - 250 psig High Head Pressure = Above 275 psig R410A System Normal Head...
20 Sep, 2024
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TUD/TDD - Flashing Code 3
Trane Gas Furnace: TUD1/TDD1 Re: Flashing Code 3 Code 3 = Pressure switch fault A Code 3 will result from either of the following conditions: Pressure switch contacts "closed" when they should be open. Pressure switch contacts "open" when they should be closed. ► If the pressure switch is...
9 Sep, 2024
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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 ...
9 Sep, 2024
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GMS9/GCS9 - Flashing Code 4
Goodman Gas Furnace: GMS9/GCS9 Re: Flashing Code 4 (Assuming original control board) Code 4 = Limit Circuit Open If the Limit Circuit opens, the burners will be de-energized and the air circulation and vent blower will be turned on until the Limit Circuit closes. The diagnostic light code...
21 Aug, 2024
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