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
Common fault one: the unit just started, not running
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;
Solution: Normal.
Common fault two: the host heat absorption fin frosts
Check: defrosting probe failure or (measure) refrigerant content is missing, or capillary micro-blocked, dirty blocked, ice blocked.
Solution: Replace the defrosting probe; Charge the same type of refrigerant, vacuum if necessary, and then charge the capillary tube.
The reason: er05: insufficient protection of water flow, the heat exchanger produces heat when the host is working, circulating pump water to the heat exchanger to take away the heat, water should have enough flow to the heat exchanger inside the host to take away the heat, if the flow is insufficient there will be er05 error prompt, should check the installation of pipeline lines and circulating pump power enough problem, this is a function of the machine to protect the host!