Brand guide
All Honeywell / Resideo water heater guides
Choose the symptom or code that matches your unit. Confirm the exact model and control generation against the rating plate before following model-specific instructions.
Pilot and ignition problems
Honeywell Thermocouple Will Not Hold the Pilot
A Honeywell gas control that won't hold the pilot may need a thermopile, not a thermocouple. How to identify the valve type before buying parts.
Pilot and ignition problemsHoneywell Water Heater Igniter No Spark
No spark from a Honeywell water heater control usually means lockout, no 120 V, a cracked electrode, or a failed module. How to narrow it.
GasReset a Locked-Out Honeywell Water Heater
Resetting a Honeywell/Resideo water heater means turning the control to OFF, waiting, and restarting, not pressing a button. When to stop.