Allied · Furnace

LED off No power to control or control hardware fault

High severity A95/A93/95G1/92G1UHA95/95G1UHA93/92G1UH

What the control is telling you

The control LED is dark. Either the board is not getting power, or the control found a hardware fault. Code listed only in the manual; no causes or steps given.

Applies to: A95UH, A93UH, 95G1UH, 92G1UH (sizes 045-08 to 135-20)

Likely causes

No 120 V to the furnace
Control hardware fault

Test and repair steps

Turn off power at the disconnect before touching wiring or components.
Check for 120 V at the furnace and make sure the blower door is on.
If power is good and the LED stays dark, the control is suspect.

Models that show this code

15 models in A95/A93/95G1/92G1UH, A95/95G1UH, A93/92G1UH

92G1UH92G1UH0450892G1UH0451292G1UH0700892G1UH0701292G1UH0901292G1UH0901692G1UH1101692G1UH1102092G1UH1352095G1UHA93UHA93UH1DA95UHA95UH1D

Other codes on the same units

3 flashes Pressure switch open with inducer on
4 flashes High limit switch open
5 flashes Rollout switch open
6 flashes Pressure switch cycle lockout
7 flashes Lockout - no ignition
8 flashes Lockout - too many flame dropouts
9 flashes Incorrect line voltage phasing
LED on Normal operation

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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.

Homeowner looking at this code? See what it means for you and when to call a technician.

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.