Water Heaters
Water heater calls are usually the igniter, the ECO/thermal cutoff, the gas valve or the anode. Part lists for these aren't loaded yet — the diagnostic guides below cover the test sequence in the meantime.
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DSI lockout is a symptom, not a fault
A unit locking out on DSI tells you it tried to light and didn't prove flame. Work the sequence — gas, igniter, electrode gap, ECO — rather than replacing the board first.