Tempstar Partial Heating Cycle / Incomplete Ignition Sequence

Thermostat calls for heat but furnace only runs the inducer or cycles without producing warm air.

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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

Faulty pressure switch, Weak inducer on Tempstar furnace, Loose wiring to gas valve, Faulty control board timing

How to Fix / Troubleshooting

Safety: Turn off power and gas before testing components.

  • Step 1 – Observe sequence: Note exactly what happens: inducer starts, then what? Does the ignitor glow? Does the gas valve click?
  • Step 2 – Test pressure switch: Verify that the pressure switch closes when the inducer runs. Replace if it fails to close despite proper draft.
  • Step 3 – Check gas valve wiring: Ensure the wires to the Tempstar gas valve are tight and not corroded.
  • Step 4 – Inspect control board: If the board does not send power to the ignitor or gas valve at the correct time, it may be defective and require replacement.
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Repair Difficulty

Hard 4/5

Required Part

Tempstar Pressure Switch
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