Water heater and furnace status light codes
Each page covers one manufacturer’s code set for named models. Owner checks are limited to what the manual allows; everything else is for a qualified technician.
- Rheem water heater lightsWhat the blinking status light on a Rheem gas water heater means, including seven blinks, which points to different faults on atmospheric and PowerVent models.
- Goodman furnace lightsWhat the blinking LED on a Goodman GMSS96 or GCSS96 furnace means, including three flashes (pressure switch stuck open), with the only owner check Goodman allows.