Shop Products
Houzz Logo Print
barkster_gw

pentair mastertemp 400 won't start

barkster
9 years ago

My heater work periodically, when it doesn't it will turn on, and I get the 128 and r=5 messages then it doesnt start. If I hit pool or spa nothing happens. Sometimes it works great but most it doesn't do anything. I get no error and diagnostic light shows nothing. I've checked flow sensor and I think that's the only one that would prevent from even trying to start?? Gas is one and of course it has power. What can I check next?

Comments (5)

Sponsored
Vivancos Trim LLC
Average rating: 4.3 out of 5 stars7 Reviews
Loudoun County's Artfully Crafted General Contractor