I have a mastertemp 400 HD heater and I'm having an issue with maintaining the temp. Initially when you turn it on, it stays on and heats it up well. However once it reaches the set temp, it will shut off Rapidly instead of staying on for a few minutes to heat it back up to a degree or two over the set temp. It will turn on for about 20 seconds then shut back off, but overall maintains the set temp of the spa. In addition, the heater thermostat is a few degrees above the overall system...
MasterTemp 400 HD Shutting Off Rapidly
MasterTemp 400 HD Shutting Off Rapidly
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