electric boiler, hi-limit switch
I installed a Seisco boiler for a friend just a year ago and it’s been working flawlessly until a couple days ago when she called me to say the house was freezing. I had a prior commitment and couldn’t go to her plac, but some noodling in the service section of the Seisco website led me to suspect the high-limit switch[es]. (Four chamber model)
I couldn’t convince her to unscrew the cover and push the switches to re-set them, so she called a repairman the next day and told him my prospective Dx. He pushed the switches, did some checking to make sure they were working properly, and the boiler’s been working fine for over 24 hours now. They didn’t even charge for the service call!
I [think i] understand what function the high-limit switch performs, but i can’t figure out why/how the water temp could spike to cause it to trip minus some major problem in the boiler. The local electrical service is a rural co-op with occasonal power outage, but wouldn’t the high-limit switch need actual high-temp water to trigger it, not just an electrical input variation?
Here’s the critter:
Replies
Several things can cause a high limit to trip without there being a major problem.
Air pocket, power fluxuation, loose screw, vibration, dust on the circut board etc etc etc.
“The world is a dangerous place, not because of those who do evil, but because of those who look on and do nothing.” —Albert Einstein
Thanks; that's what i needed to know before i commenced panicking. <G>