Troubleshooting

electrical shock hazard confirm all circuits are de energized before performing any wiring activity check all wiring, particularly any connections gently pull on wire connections to the pod and heat pump to make sure they are tight check that the water is on, all valves are open, and there are no leaks the sanco2 heat pump does not turn on check that the heat pump is powered on (red dot blinking on display) check that all isolation valves are open thoroughly purge the heat pump from all three purge valves (cold line, hot line, and circulator pump valve underneath the unit) ensure there is no debris obstructing the flow ensure there is no spring check valve on the sanco2 check all wiring connections are good at the heat pump and pod sanco2 control panel displays h7 this indicates a wiring error with the tank temperature sensor check all of the temperature sensor connections ensure all idc's are completely crimped and the heads are flush with the casing check for any cuts or defects in the cat5 cable between the pod and the sanco2 check wiring connections of terminals 1 & 2 in the sanco2 the heat pump signal box tank temperature sensor reading above 120°f after heat pump has completed a full charge (heat pump has stopped) ensure the tank temperature sensor is fully inserted into the back of the thermowell, and use a plug of insulating material to reduce thermal losses and prevent tension on the wire from pulling the sensor warning do not use a clip to secure the sensor as it can cut into the wire insulation and creat an electrical short chemical smell in water from sanco2 gs4 installation manual if any bond or flux has entered the tank unit and the hot water has a chemical/acrid smell, take the following countermeasures a) after heating the water in the tank unit, drain it and clean inside the tank unit fill the tank unit with 26 gallons of water and exchange twice b) fill up the tank unit c) drain water from the the relief valve for one to two minutes d) run water from all the hot water supply faucets in the house for about ten minutes to clean inside the pipes for issues relating to units within the system such as the air handler, refer to the manufacturer's documentation and/or website for guidance