Another pool season another heater issue ... Mastertemp 400 wont start, no error codes

Zizzam

Member
Apr 21, 2022
20
West Simsbury, CT
Hi all, you all helped me a LOT last season troubleshooting my Pentair Mastertemp 400 and things were working well at the end of last season.. Well the pool has been opened and I have a new issue that I dont even know where to begin troubleshooting. When I attempt to start the heater (pool or spa mode, it makes no difference), the system powers on, the display shows 128, then r14 as expected, then shuts off. No Service light, no error code, no error LED on the bottom of the board, no noises, clicks, the blower doesnt attempt to start, nothing happens. The display shuts off and thats it. So the system has power, it has gas, the valves are open... I'm not sure where to even start troubleshooting this. Thanks for any suggestions
 
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