HVACopediaAllied · Furnace
2 flashes Pressure switch closed with inducer off
What the control is telling you
The pressure switch is closed when the inducer is not running. The control will not start the inducer. Code listed only in the manual; no causes or steps given.
Applies to: A95UH, A93UH, 95G1UH, 92G1UH (sizes 045-08 to 135-20)
Test and repair steps
- Turn off power at the disconnect before touching wiring or components.
- With the inducer off, check that the pressure switch contacts are open.
Models that show this code
15 models in A95/A93/95G1/92G1UH, A95/95G1UH, A93/92G1UH
Other codes on the same units
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Source: Allied 506724-01 (Issue 1108) A95UH/A93UH/95G1UH/92G1UH Installation Instructions, Diagnostic Codes p.53. Summarized in our own words; check the original manual for your model.
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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.