On/Off Thermostat blown? Advice please..

Tim_Cranwill · 06-24-03, 12:41 AM

I was rewiring all of my heat tape today to prepare for all of my 2003 acquisitions. I am going with a total of 504 Watts of 4" and 11" tape. Once I got things all wired up I plugged in my thermostat (1000 Watt max) and something blew. My basement fuse didn't shut off though. Now when I plug in the thermostat, everything works except it won't put out any power. The dial will accurately engage at the proper temp, the LEDs all work... but no output!

I troubled shooted every possible option and it has to be something in the thermostat. When I opened the sucker up, there wasn't a burnt smell and there was no discoloration or any other visible signs.

So, if there are any electrical buffs out there, what could have happened? Please help me!!!

Too much has been going wrong lately... I guess I'm due for some good luck soon though!

Lisa · 06-24-03, 02:37 AM

katey says it sounds like there's a short in your heat tape and you blew your output transistor.

Depending on your skills you may be able to repair it, you probably just have to change the out put transistor which is most likely a SCR transistor (i'm just repeating what katey says as i don't have a clue about electronics).

Corey Woods · 06-24-03, 05:40 AM

If you are using a Helix thermostat open up the black power box and their is a 5 watt fuse (replacement cost $0.50).

Corey

Tim_Cranwill · 06-24-03, 10:15 AM

It's not a Helix. I ordered it from The Bean Farm. On their web page it's called "Alife Reptile Electronic Temperature Controller" but mine has an "ESU Reptile" sticker on it. It must just be a generic thermostat that different companies slap their label on...

Anyway, I thought basically the same thing as you guys. I will hit Radio Shack today to see what they have...

Thanks guys!