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For some reason we are losing 24 volts to the thermostat. Most common reason is a stopped up drain with a float switch.Lets start by looking to see if you have afloat switch in main drain.If so lift the float and see if we can get unit to stay on.
Do you have an air tank you can blow drain out with. Sounds like we have a partial blockage. AS water seeps out, float allows unit to come back on. The flashing is a time delay so that everytime it shuts off and back on we have a delay before outside comes back on.As soon as it comes on and starts making water float trips it again.
Let me know if that solves .
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