Troubleshooting, Circuit diagram – A.O. Smith 10 User Manual
Page 9
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Troubleshooting
Problem
Cause(s)
Action
Yellow and Red light
off
No hot water
No power to heater
Turn on electrical switch. Check for
blown fuses or tripped breaker
Thermal cutout switch open
Reset. Check for source of trouble and correct
Control circuit or internal
wiring error
Call Customer Care Center on 1.800.103.2468
Yellow light on Red
light off
No hot water
Non-functioning
thermostat
Control circuit or internal
wiring error
Call Customer Care Center on 1.800.103.2468
Water temperature is
too high
Thermostat set is too high
Thermostat to be replaced
Call Customer Care Center on 1.800.103.2468
Thermal cutout trips
Call Customer Care Center on 1.800.103.2468
Water heats slowly
Non-functioning element
Element to be replaced
Call Customer Care Center on 1.800.103.2468
Thermostat does not
shut off
Non-functioning
thermostat
Thermostat to be replaced
Call Customer Care Center on 1.800.103.2468
Improper calibration
Thermostat to be replaced
Call Customer Care Center on 1.800.103.2468
Piping connection leaks
Connection not sealed
Re-connect piping, using sealing tape
Leaky cover
Tank or parts leak
Shut off power immediately and
Call Customer Care Center on 1.800.103.2468
Circuit Diagram
High limit