Troubleshooting - A.O. Smith CAHP-80 User Manual

Troubleshooting

Problem
Display is off
No hot water
Display is off
High water temperature
Display on, no hot water
Leaking from tank
Dripping from pipe joints
Display "E1"
Display "E2"
Display "E4"
Display "E5"
Display "E6"
Display "E9"
Display "EA"
Display "EC"
Display "EF"
Display "H0"
Display "H2"
Display "H3"
Display "H6"
Display "H7"
Display "H8"
Display "H9"
Display "HF"
Possible causes
1. No power to heater
2. No power at electric socket
3. Failure in control circuit or internal
wiring
1. High temperature limit switch
tripped
2. Electrical circuit failure
Heating element or internal circuit
failure
Leaking tank or components
Unsealed joints
Mid-lower tank temperature error
Lower tank temperature error
Mid-upper tank temperature error
Low voltage alarm
Upper tank temperature error
High voltage alarm
Dry combustion
Communication error
Abnormal heating
Circulating temperature error
Compressor low pressure error
High discharge temperature error
Evaporator temperature error
Ambient temperature error
Discharge temperature error
Suction temperature error
Fan error
Corrective action
1. Switch on power to heater
2. Check power socket
3. Contact local authorized dealer
1. Switch off power supply
2. Contact local authorized dealer
Contact local authorized dealer
1. Switch off power supply
2. Contact local authorized dealer
Reconnect pipes of the water
heater and be sure to use sealant
Contact local authorized dealer
Contact local authorized dealer
Contact local authorized dealer
Contact local authorized dealer
Contact local authorized dealer
Contact local authorized dealer
Contact local authorized dealer
Contact local authorized dealer
Contact local authorized dealer
Contact local authorized dealer
Contact local authorized dealer
Contact local authorized dealer
Contact local authorized dealer
Contact local authorized dealer
Contact local authorized dealer
Contact local authorized dealer
Contact local authorized dealer
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