Wolf No Heat with Blower Only

Furnace blower runs but burners do not light; no error code displayed.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Thermostat not calling for heat (fan-only mode), Open gas shutoff valve closed, Faulty gas valve on Wolf furnace, Ignition control not initiating sequence

How to Fix / Troubleshooting

Safety: Turn off power and gas before inspecting gas components.

  • Thermostat mode: Confirm the thermostat is set to HEAT, not FAN ON with no heat call.
  • Gas supply: Verify the manual gas shutoff valve near the furnace is open. Check other gas appliances for normal operation.
  • Observe sequence: With panels in place and power on, call for heat and watch through the sight glass. Note whether the inducer starts, igniter glows, and gas valve clicks. This helps isolate which stage is failing.
  • Professional diagnosis: If the ignition sequence does not start or stops before gas valve activation, a technician should test the Wolf control board, gas valve, and safety chain.
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Repair Difficulty

Hard 4/5

Required Part

Wolf Gas Valve Assembly
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