Heater Turns on for 15 Seconds then Shuts Off

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K

kawfhw

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Jul 9, 2010
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We have a two-year old pool with a MasterTemp 4000 gas heater. It had been working fine, but when we tried to heat the spa the other day the heater ignited, ran for 15 seconds then shut off. We have replaced the thermostat, a relay and the igniter, but the problem persists. Any thoughts?

Thanks.

Ken
 
Had the same problem with my variable speed pump. I had the pump running to low (~2,500 rpm). When increased to ~3,000 rpm, heater stayed on. The heater manual did say that low water flow will cause it to cut off.

Good Luck
 
I agree that it sounds like a flow issue. It may seem like a dumb question, but are all the appropriate valves open? That pump should give you plenty of flow, unless there's a problem somewhere. Do you get decent flow at the returns?
 
If you bought three or more Pentair products at the same time you are still under warranty. You should not have to replace the thermostat, a relay and the igniter already.

Sounds like you may have spider webs in the ports, or another build up. Did you pull the face piece and take a flashlight and look at the burner tray? I would take a look in there, as the fact that it is at least igniting tells me that everything is basically working.
 
Welcome to TFP!!

Let me throw out my $.02 - check the thermal regulator, if it's shot cool water will not mix with the heated water and the temp will climb high enough to trip the high limit switch in ~ 10 - 15 seconds.

Of course there are other possibilities, you can 'jump out' any suspect switches, rather than just blindly replacing parts :cool:
 
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