Question about Pentair 460736 Master Temp Pool Heater 400btu ()

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My system is short cycling. the unit fires and begins fine, yhen after about 90 seconds the service heater light comes on. the service heater light remains on for about 60 seconds then the unit goes back to heatingfor about 90 seconds. the process just keeps repeating

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6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

rcampsr
  • 90 Answers

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

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

wiredlocal22
  • 2 Answers

SOURCE: Minimax NT cycles on, Flame

I had the same problem and it was the ignition mod after i replaced that it ran fine again .

Posted on Jun 01, 2009

  • 990 Answers

SOURCE: Startup cycle goes fine. All lights(power,

If you are getting fire and have an eo5 this is a reading for no flame so it is not reading the flame. What you probally have is small spider webs in your burner orfaces. You will need to pull the burners out and with a small wire or the like clear the gas orfaces going to the burners. These little webs can divert the gas to the main burners and keep it from the burner that reads the flame. Your heater will come on with a big woosh as the gas needs to come from other burners to fire. I hope this helps. Good luck

Posted on Nov 28, 2009

  • 990 Answers

SOURCE: pool heater seems to fire,

It's not reading the flame. This could be many things. If you have an electronic ignition you will find a wire going down to the front of the firewall to just above where the burners go into it. It connects to a piece that has one screw holding it and that goes through the wall and into the burner box. If you pull the tray and inspect the burner just below it their may be soot or something keeping the flame from getting to this probe. If the wire from the probe is grounding any where of if it got rat chewed this can cause this problem. Follow this wire to the top of the heater and make sure it is securely fastened to the ignition control on the terminal that says sense. It could be these problems or the ignition control box may have gone bad (ooo! noo! $$$) At two years old I would think sooted burners or a bad wire. Also when you have the tray out you can remove the orfaces that feed the gas to the tray and check for spider webs. The orfaces unscrew with I believe a 3\8 wrench,(I could be wrong) Start with the one under the probe. These webs will look like tiny cotton balls and you can clean them by blowing out or with a tooth pic. I live in Phoenix and this is not a problem in the desert but in many places it is. So if you don't live in a desert this could be a good place to start also. Good luck

Posted on Oct 17, 2010

adamh294
  • 310 Answers

SOURCE: I have a mastertemp 250k

Yes, yo cannot "dry fire" a water heater. There are several safety measures in place to prevent this. If you were to successfully "dry fire" your pool heater, you would most likely have to rebuild it again.

Posted on Aug 04, 2011

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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

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