I replaced the head unit but still have constant heat. The unit constantly runs at 25volts even if the thermostat is on or off. If I take the head off
1777225
Taco has a good explanation of how their valves work on their web site. See http://www.taco-hvac.com/uploads/FileLibrary/100-3.pdf. According to their diagram, there should be 24 volts between terminals 1 and 2 only when the thermostat is calling for heat. If there is a constant 24 volts between these terminals, the thermostat may be defective, or there may be a short somewhere in the wiring.
1777226
Sounds like a wiring problem. The terminal strip has 3 screws. The middle one is "common" and hooks to one side of your 24V transformer. The one nearest the valve (e.g., bottom) is the one which goes to your "controller" along with a wire from the "common"; the other wire furthest from the valve (or base) goes to the thermostat. The other side of the thermostat then hooks to the remaining (other) terminal on the 24V transformer. Sounds like problem may be associated with thermostat connections. If you still have the box it came in, check the diagram. Sounds like a wiring mistake but probably not a serious problem. Sounds like a wiring problem. The terminal strip has 3 screws. The middle one is "common" and hooks to one side of your 24V transformer. The one nearest the valve (e.g., bottom) is the one which goes to your "controller" along with a wire from the "common"; the other wire furthest from the valve (or base) goes to the thermostat. The other side of the thermostat then hooks to the remaining (other) terminal on the 24V transformer. Sounds like problem may be associated with thermostat connections. If you still have the box it came in, check the diagram. Sounds... » Read More Sounds like a wiring problem. The terminal strip has 3 screws. The middle one is "common" and hooks to one side of your 24V transformer. The one nearest the valve (e.g., bottom) is the one which goes to your "controller" along with a wire from the "common"; the other wire furthest from the valve (or base) goes to the thermostat. The other side of the thermostat then hooks to the remaining (other) terminal on the 24V transformer. Sounds like problem may be associated with thermostat connections. If you still have the box it came in, check the diagram. Sounds like a wiring mistake but probably not a serious problem. « Show Less
961962
I have been using the power supply for a few months. The unit operates well. But it has problem with heat sinking. The unit has a finned heat exchanger to dissipate the heat but the power will cycle on / off because of the temperature rise due to inadequate natural heat convection. If you want the unit to operate all the time, you need an external fan to blow air on the finned exchanged. I hope this is helpful to you. Regards, Ram
2159459
What I have found is if you turn the thermostat all the way up it acts as a constant on. Hope this helps
316461
I don't think it's normal. That is why I returned mine. Would not run for more than a few minuets before overheating and the safety would shut it off. I know of people who have had success with it but not me and looks like not you either. I'd return it because overheating that quickly could lead to blown fuses or fire.
253814
Your power source is integrated into your thermostat wire. Its not a separate power source. Most HVAC systems have a 24v power integrated. The battery is just a back up and to keep your settings.
2019255
Make sure the blue plugs are together for cooling. Otherwise you might have to send in for a new plug
2193242
Chip, I had the same problem several times. I finally registered my unit on Broan's website and included my disappointment with the issue. I was contacted the next day by their customer service department with the phone # for their service department. I called them immediately, they pulled up my information and explained that they had identified the problem and it could be easily fixed with a replacement heater and fan element. The original unit did not start fast enough and would burn the thermal fuse, the new motor started faster and therefore the thermal fuse would not blow. The fuse is part of the heater element to prevent overheating. I explained to the rep that it was -7 outside and I didn't feel like going into the attic again to replace the unit. he explained that I could replace the part fromt he inside and it was a matter of 2 screws and a wire harness. It literally took me less than 1 minute to replace the part and it has worked better than the original since. My previous ones only lasted less than 2 weeks. I was very satisfied with Broan which is more than I can say about the big box store I bought it from. The # for the technical support department at 800-637-1453. That should solve the problem.
1725274
There is an on/off rheostat dial on the front of the unit. This would be fine if you are running straight power to the heater. I have the heater set at its highest setting and my power comes from a wall thermostat. Hope that makes sense to you.
658471
Same thing happened to me. Unplugged it until it turned off. Plugged it back has been operating normally. You need to protect it from excessive heat when the car is parked.
1427181
If you feel uncomfortable with the units power transformer, then you should return it or just get a new one. I have measured my transformer heat output and at in house temptress of 75°F, it is around 95°F They are designed to get hot and have vent slots to allow cooling, unit is reducing your household current from 120VAC/60Hz/10VA down to 12VAC/6VA. That in itself causes the unit to get hot. A bad pump will also cause unit to over heat. My unit has worked fine for over a year, but I clean it monthly including build up that tends to clog pump. Enjoy
1178818
If this happens turn the thermostat clockwise to a hotter setting . Up to and as far as completely, turned to the full stop position . If this does not bring the hot air back on . You have a defective unit.The only way the thermostat should work.Is that if the room reaches the maximum temperature . That the thermostat [dial ] is set to respond to. It should turn off both fan and heat. then when it drops below that setting again. It turns on both fan and heat together. If that is not what yours is doing. It needs to be replaced or repaired .If thats possible.But that would only be,,, to my knowledge,, under any [ short ] warranty it comes with If this happens turn the thermostat clockwise to a hotter setting . Up to and as far as completely, turned to the full stop position . If this does not bring the hot air back on . You have a defective unit.The only way the thermostat should work.Is that if the room reaches the maximum temperature . That the thermostat [dial ] is set to respond to. It should turn off both fan and heat. then when it drops below that setting again. It turns on both fan and heat together. If that is not what yours is doing. It needs to be replaced or repaired .If thats possible.But that would only be,,, to my... » Read More If this happens turn the thermostat clockwise to a hotter setting . Up to and as far as completely, turned to the full stop position . If this does not bring the hot air back on . You have a defective unit.The only way the thermostat should work.Is that if the room reaches the maximum temperature . That the thermostat [dial ] is set to respond to. It should turn off both fan and heat. then when it drops below that setting again. It turns on both fan and heat together. If that is not what yours is doing. It needs to be replaced or repaired .If thats possible.But that would only be,,, to my knowledge,, under any [ short ] warranty it comes with « Show Less
339170
Mine recently started doing the same thing, after working great for a couple years. Opened it up & found the thermostat had disintegrated. Turn it upside down (not plugged in!!!) and listen for objects rolling around. If so, your thermostat has likely died too. There's no good fix, other than bypassing the thermostat - which is a home-fire hazard. Sorry, you'll probably have to trash it (unless it's still under warranty)
2099843
I haven't had that problem. My thermostat follows the schedule I've programed. There may be a problem with your unit.
1487001
I am no expert, but I think that basically you have a heat pump (w/ Aux & Em) like I do, so this thermostat should work as expected; actually, for me, it is a great unit, better than a more expensive model I had before!
381046
Send it back because the thermostat is set for high altitude and will not work properly.I did exactly the same as you did and returned for another Bunn model
1276671
I suspect your professional installer did not provide power to the constant hot (usually yellow wire) this wire must have a continuous 12 volts(not switched) look at your manual, take it back!
466337
I have the same problem but it is actually a benifit in my case. I'm using it to power a car stereo in a wood box and the fan keeps the radio cool too. I purchased a "MEANSWELL" power supply for twice the price of this unit and it's fan never comes on and it powers 2 300watt car amps without any problems at full load