HVACopediaGoodman · Air conditioner
Comfort Alert 9 Yellow ALERT 9 flashes - low control voltage
What the control is telling you
Control circuit voltage below 17 VAC.
Applies to: Amana ASX13 (CA revision) and ASX14 (1CA, 1BA and 421DA revisions) condensers fitted with the 2-wire Comfort Alert module
Likely causes
- Overloaded control transformer
- Low line voltage
Test and repair steps
- Measure 24 V at the module with all loads on.
- Reduce transformer load or fit a larger transformer.
- Check supply voltage; contact the utility if low.
Models that show this code
142 models in Goodman/Amana R-410A GSX/ASX/DSX (ANX/SSX/VSX)
Other codes on the same units
- Comfort Alert 4 Yellow ALERT 4 flashes - locked rotor
- Comfort Alert 5 Yellow ALERT 5 flashes - open circuit
- Comfort Alert 6 Yellow ALERT 6 flashes - open start circuit
- Comfort Alert 7 Yellow ALERT 7 flashes - open run circuit
- Comfort Alert TRIP Red TRIP LED - call present but compressor not running
- Comfort Alert TRIP+ALERT TRIP and ALERT LEDs flashing together - control voltage too low
- CoreSense 1 Yellow 1 flash - long run time (low side)
- CoreSense 2 Pressure trip - yellow 2 flashes (red 2 = lockout)
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Source: Goodman RS6200006r103 R-410A ASX/GSX/DSX/ASZ/GSZ/DSZ service (text export) - Goodman_R_410A_ASX_GSX_DSX_A_C_and_ASZ_GSZ_DSZ_HP_covers_GSX_GSZ_lines_GSXH5_GSZH5_service.txt - section Diagnostics Table: 2-Wire Comfort Alert Module. 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.