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My Hayward h400 pool heater has service light on will not light

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  • Pentair Master
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Check gas and ignitor

Posted on Nov 16, 2017

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Posted on Jan 02, 2017

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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

  • 11 Answers

SOURCE: my pool heaters starts to hum and the service light comes on

millivolt heaters generate their own power from the flame on the pilot max is usualy 750 millivolt, check all connections clean and secure.
Mmake sure the pilot is lit

Posted on Jan 01, 2010

  • 760 Answers

SOURCE: pool heater is not working properly

So I assume you have pressed the button by pool to select the pool thermostat? If this doesn't work sounds like another mother board problem, or try powering down the unit a few minutes then restart. IF you haven't pressed the pool button, the read this: The heater comes factory set at 78° F. for the pool mode and 100° F. for the spa mode. If it's in spa mode it's trying to get to 100F. Using the up and down arrows,you can set the thermostats to a minimum temperature of 65° F., or a maximum of 104° F. If you desire to heat only one
body of water, the thermostat is capable of an off mode. As an example, if you only wish to heat the pool and not the spa simply depress and hold the spa down arrow, and the thermostat will lower its setting to 65° F. then go to an off mode. Here is a link to your manual :http://www.pentairpool.com/pdfs/MasterTempOM.pdf

Posted on Jul 08, 2010

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