Bradford White UDH-75T-50FR-3N User Manual
Icon - ultra low nox water heaters, Technical support

ICON - Ultra Low NOx Water Heaters
ERROR CODE
DEFINITION
SERVICE ACTION
POSSIBLE PARTS NEEDED
No LED
No pilot light / Heater not in operation
Follow lighting instructions
1) None
on the water heater
One flash & three second pause
Knob in pilot position or thermostat satisfied
None
1) None
LED on continuously
Control knob turned to the off position
Wait for LED to go off before relighting
1) None
Two flashes & three second pause
Weak pilot signal detected
Verify pilot is lit
1) Pilot assembly
Check thermopile voltage output
2) Gas valve
Check wire connections at gas valve
Three flashes & three second pause
Control has not seen temp rise
Check temp probe ohms
1) Gas valve
in proper amount of time
Check gas pressure
Verify water is not flowing
Four flashes
High tank temperature
Check temp probe ohms
1) Thermowell
& three second pause
Check gas valve
2) Gas valve
Five flashes & three second pause
Thermostat sensor fault
Check temp probe ohms
1)Thermowell
Check gas valve cover
2) Gas valve
Six flashes & three second pause
Chamber door temp sensor out of specification
Check door sensor ohms
1) Chamber door sensor
Clean screenlok
Clean burner
Seven flashes
Gas valve fault
Reset gas valve; if problem persists
1) Gas valve
& three second pause
replace gas valve
Eight flashes
Pilot remains lit while the control knob
Check gas pressure
1) Gas valve
& three second pause
is in off position
Replace gas valve
Ten flashes & three second pause
Insufficient combustion air detected
Check gas pressure
1) Chamber door sensor
Clean screenlok
Check venting
Clean burner
NOTE:
Check all wire connections
Check gas inlet and manifold gas pressure
Check for grounding connections
Technical Support
800-334-3393
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