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I've read all the previous threads that come up on the Master Temp heaters and none seem to match the exact issue I'm having with my MT400. It will ignite and run for 25-30 seconds, then the service heater light comes on. Some times it will set the AGS LED sometimes the HLS LED. If I jump both...

Not sure if this should go here or under hot tubs/spa. I maintain a 800gal hot tub for a members only gym that typically runs 16-18 hours a day. The sanitizer and Ph levels are maintained with a Polaris Watermatic C660. The ORP sensor is around 6 months old and the Ph sensor is pushing a year...

I have a MT 250 running the heat on the hot tub in the gym I work for and I keep getting a random E01 code and the heater shuts down. I have been able to determine that E01 is referring to a temp sensor error, but can not find any information on how to actually diagnose the problem. The heater...