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Allied · Furnace troubleshooting

Unit fails to operate

A95A9395G192G1UH

What is going on

Check these items in order before calling for service.

Likely causes

  • No heat call from thermostat
  • Access panel not secured
  • Main disconnect open
  • Blown fuse or tripped breaker
  • Dirty or plugged filter, which causes the limit control to shut the unit off
  • Gas off at the meter
  • Manual main shut-off valve closed
  • Internal manual shut-off valve closed
  • Ignition system in lockout

Check in this order

  1. Confirm the thermostat is calling for heat.
  2. Confirm all access panels are secure.
  3. Confirm the main disconnect is closed.
  4. Check for a blown fuse or tripped breaker.
  5. Check and replace or clean the filter if dirty or plugged.
  6. Confirm gas is on at the meter.
  7. Open the manual main shut-off valve.
  8. Open the internal manual shut-off valve.
  9. If the ignition system is in lockout, reset by moving the thermostat off and back to heat. If it locks out again, inspect the unit for blockages.

Applies to: No burner operation

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Source: Allied 92G1UH installation manual, p. 46. 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.