Occasionally we receive inquiries into the Propex technical support team describing electrical conditions that are outside the typical diagnostic flow of the heater. This could be something like a heater working on the fan setting but not on the heat setting or perhaps having no response at all despite 12V applied and the onboard fuse testing good.
It's important to remember that there are several opportunities throughout the course of heater installation in which it's easy to inadvertently pull wires out of an electrical connector. Installing the thermostat harness is one example. When fishing the thermostat harness through a wall, connect your fish tape to the harness sheath itself, not the connector.
If you suspect you have an electrical issue, verify that you have 12V passing through the inline fuse and to the heater. Verify that your ground wire is well placed and tightly connected.
Still having issues? An easy test you can do is to use an ohmmeter to check for continuity through the connectors on each end of the thermostat harness. Disconnect the 12V power source to the heater (always do this BEFORE disconnecting the thermostat from its electrical connector) and then disconnect the thermostat harness at both ends. Use one ohmmeter probe on one end of the harness and the other probe at the corresponding wire on the connector at the other end. Make sure you're checking at the connectors and not the wires as you're trying to ensure that the wires are still solidly attached to the connector. Once you have tested all the connections for continuity, reattach the harness to the circuit board and thermostat. Reconnect the 12V power and retest the heater.
If you've eliminated the wiring connectors from causing the issue, please read the other tech support articles in this library to see if one applies to your situation. If you don't find what you're looking for, email support@vancafe.com to work with a technical support agent.