20 Most Recent Pentair Mastertemp Pool & Spa Heater Dual Electronic Ignition 400,000 Btu Lonox Propane 460737 Questions & Answers


E05 and E06 is the error codes for a faulty stack flue sensor. try changing the sensor first is the cheapest. if that doesn't work check for corrosion on control board in which case will have to change out board.

Pentair... | Answered on Feb 06, 2021


I have the same exact problem with this unit. Obviously getting gas to the unit, because it runs and pumps out some serious heat for a short time, but then kicks off. Did anyone ever figure this out or did you buy a new heater? :-)

Pentair... | Answered on Mar 10, 2019


Hello.... HLS usually means hi limits.... check the connectors at the high limit switches, to make sure they're not rusting off. If they're good, and the heater fires, but turns off after a minute or two, the problem lies usually with the temperature regulator.... it's the round cover with the 4 slits in it between the inlet and outlet. It comes out counter clockwise. It holds a spring with what would be a car thermostat attached to the end of the spring. That thermostat can be malfunctioning, and it will allow the water to get too hot coming out of the heater, which trips the hi limit. A quick fix is to remove the spring with the temperature regulator, and put the cap back in place. You definitely want to get another one to replace it, because the efficiency rating of the heater will go down considerably.... but it will do the job in the meantime with no danger. (Its like running a car with the thermostat removed, it can be done, but the engine runs too cool). They cost about 50 bucks on amazon.

Pentair... | Answered on Jun 21, 2015


Number one sounds like a board issue or if the pool is on automation the temp sensor. Number two sounds like the thermo regulator which is located in the inlet/outlet headers.

If you need further help, reach me via phone at https://www.6ya.com/expert/keith_d879ea386fed3a1a

Pentair... | Answered on Jun 10, 2015


check the fuse inside the control box

Pentair... | Answered on May 25, 2015


Could be the temp sensor about 50-60 bucks, the book will say the board about 350-500 bucks. Try the temp sensor first. If it's reading over what the water is then that is probally the problem.

Pentair... | Answered on Sep 22, 2012


This issueis related to the stack flue sensor and it might have a wiring problem or a bad sensor. I recommend you call the Pentair technical support at 800-693-0971and they should be able to help you figure this issue out further. Ihope this helps.

Pentair... | Answered on Oct 21, 2011


Since I don't know exactly what model you have I can only suggest you call the Pentair technical support at 800-693-0971 andthey should be able to help you figure this issue out.

I hope this helps.

Pentair... | Answered on Sep 14, 2011

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