Caldera Spas / Hotsprings heater board replacement for the Invensys Appliance Controls IQ 2020 Caldera Spas Part 73181 . What to look for to make sure you're replacing the correct part when your Caldera Spa does not heat...
Symptoms:
- Spa works fine but does not heat
- No error codes on topside display
- Spa pack heat indicator lights are on
- No voltage to heater
- On the heater board in the center relay look for discoloration on the green part of the circuit board.
- If you don't see discoloration remove board with power off and look at the underneath for a burn mark.
What to purchase:
- Heater board 74618 is your replacement.


