Test compressor idling current, check current transformer and thermal relay, adjust voltage stabilizer, etc.
Check the amount of refrigerant in the system, clean the heat pump throttling device, replace the exhaust probe, etc.
Check the refrigerant quantity, circulating water pump flow, clean the condenser, check the water pressure switch, etc.
Clean the air supply and exhaust heat exchanger, check the ignition device and gas solenoid valve, etc.
Check the ignition device, gas solenoid valve and electronic controller, etc.
Check the water outlet temperature sensor and gas proportional valve‌
Check water flow, water pump operation status, water flow switch, etc.
Pay attention to the slope of the water system and the installation of the drain valve to prevent freezing accidents.
Check the system water circuit and fluorine system, repair leaks and replace damaged parts.