Old Raypak Versa 265b heater goes on and off when heating spa, but stays on when heating pool. Temperature sensor or Unitherm Govenor??

[cdlevy23]

Hi, I have an Old Raypak Versa 265b pool/spa heater that I hadn't turned on in over a year. I started it up the other day and it was fine, but heats the spa for about 10 mins then starts turning on and off every 5 mins. If I heat the pool with it, its stays on just fine, which leads me to believe their is an issue with the temperature sensor? Being that the pool is 20,000 gallons, so unless I run it it for 48 hours straight the water is never getting above 70, as compared to the spa which is heating up much quicker. Any advice on if it's most likely the temperature sensor or could it be something else like the Unitherm Governor or high limit switch?

Any help and/or suggestions would be greatly appreciated.

 

[ajw22]

Welcome to TFP.

That type of cycling is often caused by low flow overheating the water triggering the HLS sensor.

When was the last time you cleaned your filter? What is your clean filter PSI and what is it now?

What type of pump and filter do you have? Please create your signature with details of your pool and equipment. IT lets us better understand what could be happening.

 

[cdlevy23]

Hi, thanks Allen. I updated my profile. I have a A.O Smith 1.5hp pump and a Pentair 150sqft cartridge filter. I just cleaned it the other day. I'll check the pressure tomorrow and get back to you, as i just glued in some new pipe to replace an old portion and am waiting for it to dry thanks!