844 StarCool Alarm Codes

844	Hot gas valve
Description	Hot gas Valve Fault
Cause	Indication of non-operating hot gas valve
Trouble shooting	Possible causes: • Cable for hot gas valve mounted on wrong valve. • Cable for hot gas valve defective. • Hot gas valve defective. • Driver circuit for hot gas valve defective. Trouble shooting: 1. Try to correct the error by uploading the latest software version to the controller. 2. If there is more than one valve failure, the cables for the valves are presumably switched. Mount cables for valves on the correct valve. 3. Listen if the hot gas valve is opening and closing, if not go to step 5). If the valve is opening and closing disconnect power to the solenoid coil, when the valve is closed and there is hot temperature after the valve (pos. 32 in the P – I diagram), the hot gas valve has a leak and should be replaced. Internal parts of the hot gas valve can be replaced separately. 4. Check that the cable for the hot gas valve is not defective. Replace cable if it is damaged. 5. Disconnect the cable for valve and measure that there is voltage on the output for the hot gas valve when it should open. a. If there is no voltage, the main controller is defective. Replace the main controller.
Criteria	Pdis more than (>) 5 BarE: Max change on Pdis: ±0.75 Bar Pdis is less than (<) 5 BarE: Max change on Pdis: ±0.30 Bar Tret is more than or equal (≥) to -15°C: Min. change on T0: +20°K Tret is less than (<) -15°C: Min. change on T0: +10°K