Troubleshooting
ELECTRICAL SHOCK HAZARD: Confirm all circuits are de-energized before performing any wiring activity
- 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
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
- 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.
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