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All lights come on except heater light coul it be tha i changed fro a large propane tant to a small tank

I moved the heater from the pool to a jaquizi and changed from a large propane tank in the ground to a small 30 pound tank the service light comes on and stays no and the burner will not come on.

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  • 372 Answers

The heater is failing to fire for any number of reasons, not related to the gas. If the heater was functioning properly you would have gotten a "call for heat"; and the ignition device would have activated whether gas was present or not. The service light was telling the truth. Best to get a tech out there to see where the problem is.

Posted on Nov 21, 2013

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 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.

Posted on Feb 06, 2009

  • 10865 Answers

SOURCE: My pool heater will not start. The power light is off and the pressure sw is lit.

You must turn on the pump and let water circulate through the pool and the heater before you turn on the heater otherwise you will ruin the heater

Posted on Apr 16, 2009

  • 10865 Answers

SOURCE: Propane patio heater ignition problem

I would change the thermocouple and here is why:

The thermocouple is the pilot's, well, co-pilot! It is the electronic device that senses if the pilot flame is hot enough to sustain burning the gas fuel from the burner. If the thermocouple thinks it's safe, then it keeps open the main gas valve located in the pilot assembly. If the thermocouple does not sense enough heat from the pilot flame (such as when the pilot is out), then the thermocouple shuts off the gas valve to the burners.
How the Thermocouple Works
So what is this thing and how does it work? Well the thermocouple (technically called a thermocouple junction) is a device that contains two metal wires welded at the ends and placed inside a protective metal case. The thermocouple sensor is found at the business end of the pilot flame and is designed to be placed in the hottest part of the flame. The other end is connected to the pilot valve body. As the thermocouple heats up, it produces a small amount of electricity and when it gets hot enough from the pilot, send a signal to open the gas valve by using a solenoid operated by a 24 volt transformer. The thermocouple calls the shots, and by converting heat to an electrical signal, it allows the gas valve to open or close. Once the gas valve is open, gas is then constantly supplied to the pilot and as required for the gas burners (as called for by the thermostat). If the pilot goes out, then the thermocouple gets cold and produces no electric signal to open the gas valve's solenoid and the gas valve shuts off the gas supply to the pilot and burners

Posted on May 27, 2009

  • 139 Answers

SOURCE: Hayward H250 FDP Pool heater won't stay lite

sounds like a flame sensor.remove ignitor assembly and clean with fine emory cloth or steel wool.when properly cleaned it should feel smooth for entire length of sensor

Posted on Jun 21, 2009

  • 83 Answers

SOURCE: sta rite 400na gives error code 05 after about 30 seconds

I am not sure if you have received an answer to the issue, or not, but just in case! An EO5 error code is an open stack flue sensor, or switch, There are two forms of the stack flue sensor, so you will need to know which one you have on the heater.

What this error code means is that the sensor "read" the flue temp to be over 500 degrees. Usually, it is just gone bad and reading the wrong temp.

Posted on Jul 14, 2009

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