Question about Pentair Mastertemp Heater

1 Answer

Heater cycles on and of, pool/spa does not reach desired temp

Heater cycles on and off(heater service light comes on) about every 60 to 70 seconds. Desired temp never is reached regardless of spa or pool selection for heating.

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Novelist:

    An expert who has written 50 answers of more than 400 characters.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

  • Expert
  • 90 Answers

Hello, It sounds like you may not be getting circulation thru the heater. Make sure the valves are open to allow water to pass thru the heating system. Some systems use a bypass on the heater so there is not a lot of wear on the coil system in the heater. If it is not circulating it will get too hot and the safety shut down will occure. If you are getting water circulating thru the heater, then the thermocouple or auto start igniter system is not working correctly. It is trying to start and can't then recycles. If the burners are igniting on the startup and then shutting back down you may have a bad control unit or thermal sensor unit. Since the unit is gas have a professional service it for you. Good Luck, RAC

Posted on Apr 20, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

Heater temp is 78 the water temp 68 how do I reset heater temp to match pool temp.


Sounds like a faulty temp sensor. Check it for debris, clean it good and see if that does it. If not try replacing it.

Jun 02, 2015 | Pool & Spa

1 Answer

I have a laars jandy 250 lt gas pool heater that only heats luke warm. The heater cycles normally then heats up but stops before reaching operating temp. No service lights and thermal switches are g


I do not have a handy but mine has a temperature setting at the heater and one on the remote. it is possible that one of the settings is low. the pool or spa temp is sensed at the heater and with the water temp located in the pool lines. so both the control board and the heater are sensing the water temperature.

Oct 09, 2014 | Jandy Laars Lt 250,000 Btu Heater

1 Answer

Pentair mastertemp 200 cycles on and off within 1 degree of set point


try calibration that might take care of problem otherwise sounds like new board

Apr 18, 2014 | Pentair Mastertemp Heater

1 Answer

Heater cycles off before desired temperature is reached


bad temp sensor reading too hot or if just a couple degrees go to calibration you can get 4 degrees each way

May 07, 2012 | Teledyne Laars Pool & Spa

1 Answer

Gas shuts off befor pool or spa reaches desire temperture. Changed temperture senor, still does same thing


if using a aqualink go into calibrate you can move 4 degrees each way also you can calibrate in heater or move water temp sensor if on aqualink

Nov 07, 2010 | Teledyne Laars Laars Lite 2 Pool Heater...

1 Answer

Pentair matertemp 400,000 BTU heater cycles on & off


My pentair matertemp 400,000 BTU natural gas heater cycles on and off before reaching desired temperature. I completely cleaned the DE filter and flow should not be an issue. When running the spa the pressure is 25. When running the cleaning system (polaris pop ups) the pressure is 30. Burner fires for 80 seconds then shuts off, reignites after 53 ceconds.Any tips on what might be the issue with the heater

Apr 04, 2010 | Pentair Mastertemp Pool & Spa Heater Dual...

1 Answer

Heater reads spa water 15 degrees higher than it is


if a 3 wire system put pool at temp desired and spa at 104 if 2 wire to firemans switch run heater all the way up to 104 the system will control the temp

Feb 22, 2010 | Jandy AquaLink RS2/6 All Button Dual...

1 Answer

Service light on


I just had the same problem resolved, my mastertemp 400 would run up the temp to 82F and then cutoff, the service light flashes and then 50 seconds later the heater would restart and run for 2 minnutesbefore shutting down again and relighting in 50 seconds. Repeating until the temp setting is reached.

I had the pool guy out 3 times until he found a bad thermal regulator valve (kit #77707-0010). Once replaced the heater runs great.

He told me that it's my pool chemestry that is to blame, I had it checked (like I do weekely by me and monthly by the pool supply store) and it perfect??? I'm now questioning what caused the corroson and stop it from coming back?

I hope tis helps.

Jan 17, 2009 | Pentair Mastertemp Pool & Spa Heater Dual...

Not finding what you are looking for?
Pentair Mastertemp Heater Logo

816 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pentair Pool & Spa Experts

Pj Kiley
Pj Kiley

Level 1 Expert

21 Answers

Jay Finke
Jay Finke

Level 3 Expert

1338 Answers

Bill Jordan

Level 2 Expert

372 Answers

Are you a Pentair Pool and Spa Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...