York Error Code 4 amber flashes: Cooling call (Y) without fan call (G) (Furnace)
York error code 4 amber flashes on a furnace means: Cooling call (Y) without fan call (G). It is also called York diagnostic code 4 amber flashes.
Homeowner? What York code 4 amber flashes means for you
Usually minor Your furnace is reporting: Cooling call (Y) without fan call (G). This code is usually informational or minor. The safe checks below often clear it; call us if it keeps showing up.
Safe things you can check yourself
- Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
- Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.
- Make sure the furnace front door or panel is closed properly; many furnaces will not run with the door switch open.
- Look at the air filter. If it is grey and clogged, replace it; a blocked filter causes many shutdowns.
- Outside, make sure the intake and exhaust pipes or vent cap are not blocked by snow, ice, leaves or a nest.
- Check that the gas valve next to the furnace is open (handle in line with the pipe). Do not force it.
- Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.
Call (647) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does York error code 4 amber flashes mean?
The board is getting a Y signal with no G signal. Heating and cooling still work but this warning shows to flag a wiring problem.
Applies to: York/JCI residential gas furnaces: York UTEC IFC furnaces, York White-Rodgers IFC furnaces, York TM9V
Common causes of York code 4 amber flashes
- G wire not connected at thermostat or board
- Thermostat not configured to send G with Y
- Broken G conductor
York models that use code 4 amber flashes
TM9V040A10TM9V060B12TM9V080B12TM9V080C16TM9V100C16TM9V100C20TM9V120D20
Other York Furnace codes
All York Furnace error codes →
York code 4 amber flashes: homeowner questions
What does York code 4 amber flashes mean?
Cooling call (Y) without fan call (G). The board is getting a Y signal with no G signal. Heating and cooling still work but this warning shows to flag a wiring problem.
Is it safe to keep using my furnace with code 4 amber flashes?
Usually yes. Code 4 amber flashes is normally minor, but if it keeps coming back have it checked.
Can I reset York code 4 amber flashes myself?
You can try one reset (power off for 30 seconds, then on). If York code 4 amber flashes comes back, the cause is still there and a licensed technician should check it.
Who can fix York code 4 amber flashes near me?
Aurora Star Tech Inc. repairs York furnaces in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.
Homeowner help: Furnace Not Turning On: What to Check · Furnace Blinking Light: What the Flash Codes Mean
Troubleshooting guides
- Blowing cold air All brands · Furnace
- No heat All brands · Furnace
- Short cycling All brands · Furnace
Source: York All JCI single-two-stage furnaces with UTEC IFC board codes ST-045-09.pdf - section Fault Code LED Flashes; York JCI single-two-stage furnaces with White-Rodgers-Emerson IFC (older installed base) codes ST-028-07.pdf - section Fault Code Sheets; York TM9V - -M9V 96% two-stage variable speed installation 1083294-UIM-A-0114.pdf - section Furnace Control Diagnostics. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.