York · Furnace

Green heartbeat Idle - no call for heat

Normal status York UTEC IFC furnacesYork White-Rodgers IFC furnaces

What the display is showing

The board LED pulses green like a heartbeat. This is normal standby: power is present, nothing is calling for heat and there are no active errors.

Applies to: White-Rodgers/Emerson and UTEC IFC boards (single, two-stage PSC and ECM)

Settings for these units

Clearance to combustibles · York TM9V
Filter size by return location · York TM9V

Other codes on the same units

10 red flashes Gas valve powered with no heat call
11 red flashes Limit open 5-15 minutes - blower failure
12 red flashes Hot surface igniter open / igniter failure
Amber heartbeat Normal - call for heat, first stage on
LAST ERROR button Read or clear the stored fault codes
LED steady off Board LED dark - no power to control
Rapid amber flash Weak flame signal
Rapid red flash Twinning error or wrong 24 V phasing

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Source: York service letter ST-028-07 White Rodgers/Emerson IFC boards, Fault Code Sheet, p.5-7; York service tip ST-045-09 UTEC IFC boards, Fault Code Sheet. Summarized in our own words; check the original manual for your model.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.