Question about Pentair Mastertemp Pool & Spa Heater Dual Electronic Ignition 400,000 Btu Lonox Propane 460737

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I also Have a Master-Temp that shuts off after the Heat runs for about 30 secs. I've checked the LEDs on the back of the control board and have a SFS light on, In addition to the E05 code on the main display. I've checked the Flu sensor with an Ohm meter and heat gun. Resistance decreases as I apply heat so I'm thinking the sensor is OK. I checked best I could for obstructions in the Flu and heat exchanger. I figure that the Air Flow Sensor (AFS) should illuminate if that were a problem. I've checked both water temp Hi Limit sensors both show continuity cold. I haven't checked them hot thinking I would have a Hi Limit LED if they were the problem. Any ideas about what I may be missing other than replacing the main control board? Unit is 1 yr old and just out of warranty of course.

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Hi!

The mastertemp E05 error code is related to the stack flue sensor and the NT is, like posted, the flame sensor code. The NT will give this code for other reasons also, such as low gas pressure, blocked orfices or inadequate air flow.

The MasterTemp stack flue snsor trips when exhaust temps reach more than 350 degrees. This is usauly caused by a flow issue or a bad thermal regulator causing the water to remain in the exchanger and over heat.

I sure hope this helps. Thanks for using Fixya

Posted on May 30, 2009

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