HVACopediaGoodman · Furnace troubleshooting
Check the hot surface igniter
What is going on
When one of these Goodman/Amana single-stage units throws 8 or 11 flashes, locks out or just won't light, the hot surface igniter is usually the first thing I put a meter on. They crack and go weak with age and they are cheap to check. Do it cold and with the power off.
Likely causes
- Cracked or weak igniter
- Open or shorted igniter
Check in this order
- Disconnect power and unplug the igniter from the control.
- Measure resistance with the igniter cold, about 70 to 77 F. Normal reading is 37 to 68 ohms.
- A reading way outside that range, or open, means the igniter is done.
- Replace it with the correct part if it is out of range.
- Handle the new one by the base, since skin oil and knocks shorten its life.
Applies to: GMES9, GCES9, AMES9, ACES9, VMES9, VCES9 (single stage, 92% and 96%)
More furnace guides
- Airflow lower than demanded, furnace runs on low stage when high stage is expected
- Alternate combustion air opening (upflow or horizontal)
- Alternate vent/flue location (upflow or horizontal left)
- Annual inspection checklist
- Auxiliary limit control (location and purpose)
- Auxiliary limit switch open (blower compartment)
Take it to the job
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Source: Goodman Service and Troubleshooting GMES9*/GCES9*/AMES9*/ACES9*/VMES9*/VCES9* (RS6612016r3) , S-308 Checking Hot Surface Ignitor p.43. 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.