It shows that er05 is a temperature sensing fault.
solution
Check whether the cable of the temperature sensor is loose.
Common faults of air water heaters
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Common fault one: the unit just started, not running
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Check: the unit is normal, and the start delay is 3 minutes after power on; When the operation is suddenly shut down and restarted, the startup is delayed for 3 minutes;
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Solution: Normal.
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Common fault two: the host heat absorption fin frosts
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Check: defrosting probe failure or (measure) refrigerant content is missing, or capillary micro-blocked, dirty blocked, ice blocked.
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Solution: Replace the defrosting probe; Charge the same type of refrigerant, vacuum if necessary, and then charge the capillary tube.