Classic Series Relay Faults | Water Systems | Water Check Valve Open | Error 15 U 10
- Error code 15 U 10
- Classic series shows 15 U 10
- 15 U 10
- Water check valve relay open
- Water check valve relay stuck open
- Turn the home circuit breaker to the unit off for 30 seconds then back on again.
- Retest the unit operation.
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