My 1996 vintage Raypak 2100 heater needs help.
I have replaced the Unitherm governor, and the bypass valve in the entry header. I have cleaned the heat exchanger tubes and have replaced the thermistor in the entry header.. Now the heater fires on POOL setting only but does not fire on SPA setting. On Pool setting, the heater runs for about 10 minutes then the service light goes on and the heater shuts down. I have all of the supply valves wide open so water flow is at a maximum level. On the control PCB, the SENSOR FAIL led lights up when the shutdown occurs. On SPA, the service light comes on immediately as does the sensor fail light on the control board.
What could be causing these issues and how should I fix them?
Thanks for the advice.
I have replaced the Unitherm governor, and the bypass valve in the entry header. I have cleaned the heat exchanger tubes and have replaced the thermistor in the entry header.. Now the heater fires on POOL setting only but does not fire on SPA setting. On Pool setting, the heater runs for about 10 minutes then the service light goes on and the heater shuts down. I have all of the supply valves wide open so water flow is at a maximum level. On the control PCB, the SENSOR FAIL led lights up when the shutdown occurs. On SPA, the service light comes on immediately as does the sensor fail light on the control board.
What could be causing these issues and how should I fix them?
Thanks for the advice.