My heater wont heat my spa over 93 degrees - Sta Rite MaxETherm Pool Heaters 333K BTU PROPANE

SOURCE: My teledyne Laars Telstar Model TGS-50 spa heater

Without doing more troubleshooting i would have to say that it is the main board (the board with the knobs on it) Take it out and see if there is any corrosion on it.

John Prohaska

• 1378 Answers
• Posted on Jul 13, 2009

SOURCE: My heater only heats the spa to 80 degrees. Where

The thermostat.

SOURCE: Spa will not heat more than 85 degrees or so

on the back of the board is the bottom for seting the max temp follow the intruction from the manual or get one at jandy.com

SOURCE: my spa heater is saying the spa is 126 degrees so

Use a thermometer to check the actual temp of the water to see if the units temp probe is accurate. Also what is the max temp allowed by the spas safety program...owners manual.
Thanks,
RSMITH972278

SOURCE: Water Temprature read 126 on heater and will not Fire

This is a problem with your thermister (heat sensor) You will find this on the left side of the water manifold about half way down. I'm not sure but I think it is a small tube that slides into the manifold and if you follow the wires back to the board it just plugs in. The part is reasonable priced for a heater part and very easy to install. Good luck.