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Rheem · Furnace troubleshooting

Gas valve does not shut off when heat call ends

What is going on

Burners stay lit after the thermostat is turned off.

Likely causes

  • W still energized (thermostat or wiring, or thermostat in FAN)
  • IFC still powering the gas valve
  • Gas valve stuck open

Check in this order

  1. Warning: If gas will not shut off, close the manual gas valve to the appliance before turning off the electrical supply - risk of explosion or fire.
  2. Set the thermostat to OFF and confirm W to C is 0 V at the IFC; make sure the thermostat is not in FAN.
  3. Check for voltage at the gas valve present with W off - check the IFC; absent - replace the gas valve.
  4. After shutdown confirm the inducer stops after the 10-second post-purge and the blower stops within 3 minutes max; if not, check the IFC.

Applies to: Rheem (-)GRC/(-)GTC and 90RJ/90TJ 90 Plus condensing gas furnaces

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Source: Rheem (-)GRC/(-)GTC Installation Instructions 92-24161-88-00, Figure 56 IFC Troubleshooting Guide, p.54 (printed); Rheem 90RJ/90TJ Installation Instructions 92-24161-32-08, Figure 53, p.54. Written in our own words; check the manual for your exact 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.