Symptoms For A Blown Fuse; Symptoms For A Working Fuse - State Water Heaters SBD71120 Service Handbook

Visually inspect the fuse to see if it is blown, the inside of the fuse can appear dark, discolored and burnt. The
link also will be broken inside.

SYMPTOMS FOR A BLOWN FUSE

• Power, Call for heat, Reset Status and ECO Status lights are not visible on the thermostat.
• 24VAC out of the thermostat via the Yellow wire to ground is not present.
• No Pilot or Main burner flame present.
• Error indication LED light on the Honeywell module not present.

SYMPTOMS FOR A WORKING FUSE

• LED status lights on the thermostat are visible.
• 24 VAC is present out of the thermostat via the Yellow wire to ground.
• 24VAC is present on the Red wire via the 24V terminal found on the Honeywell Module.
• Pilot and or Main burner flame is present.
20 Servicing should only be performed by a Qualified Service Technician