Hello! The red and yellow lights will blink if the high limit thermostat circuit has tripped.

Disconnect power for 30 seconds. This clears the high limit thermostat and resets the blinking lights.

If they begin blinking again one or more of the following is the cause. #1...clogged filter cartridge...#2...Power was not disconnected before draining...#3...Heater circulation pump non-functioning.

There are a couple of other items that can cause this problem; Air lock in plumbing supply, and blockage in plumbing.

I suspect that item #1 or #2 is the culprit.


Guru..................saailer


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