Heat controller furnace will not lite and seems to have no power ( it does )
Furnace was working 2 weeks ago just fine. Now when the thermostat calls for heat nothing happens. It does have power to it but the only thing I can get to work is the blower. I bypassed the safety switch and tried a new thermostat. please help1
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More than likely there is a power related issue within the furnace or the heat pump... Control power for the heat pump originates from the furnace control transformer. If you turn the thermostat fan setting to the 'on' position and the indoor fan comes on, the control transformer is delivering 24v control power to the thermostat circuit. If not, there could be an issue to resolve first. If the blower does come on, that's kinda good but it then means there could be a power or control issue within the heat pump itself. Any issue within the heat pump beyond making sure the 240v applied voltage is at the unit will usually be beyond the average homeowners capability to resolve.
I know this isn't much to go on, but there is such a tremendous volumn of issues that could be effecting the systems operation it would take pages to just scratch the surface. You are going to be limited to checking the basics, then my suggestion is to call a reputable service organization to resolve the issue.
The transformer is located in the furnace. You might want to check to make sure the furnace door is on correctly brcause theres a swich that will open for safety . Also some have a fuse on the solid state board.
This sounds like the relay switch on the control board may be bad. I just replaced a control board last week on a Carrier unit doing the same thing. The relays are built into the control boards. To fix this you must call a luxaire dealer and they can be found at www.luxaire.com. I will ask though, if you put the tstat into fan on instead of auto, does it come on? If it does, it could be a tstat issue. How you find this out is to remove the thermostat and expose the terminals. Take a small "jumper" wire and touch either one of the r terminals to the w terminal and hold it there. If the unit fires up with no problems, then it's the stat and not the board. Try jumping first and if it still won't come on, you know it's the control board. Good luck to both of you!
Code 12 I believe is power up after power off and a call for heat from the the thermostat. If you have a weak door switch that may be vibrating and going on and off it would cause this as would any thing that causes the power to drop low or out then reapply its self. try holding the door switch in while watching the board and after 2 or 3 minutes the furnace should go on to lite and the blower cycle off. If it stays in this mode try turning the thermostat off (heat - OFF -cool) and then push in the door switch nothing should happen except the lite on the board come on and stay on. If it does this than have someone turn the thermostat to heat and see if it starts or put the door on and set the heat and see if *** goes through the normal cycle of heating. If however it goes right back into the blower mode and shows the 12 code your problem is still with you. So next remove the wire on the "W" terminal on the board. Retry power to the door switch and now nothing should be on except the red lite. If it tries to start the 12 code and blower up again Im pretty sure you have a bad ignition/blower control board.
I have a thermostat 9600 Robertshaw and I have to use the trip switch to start my furnace. Then it reaches the temperature and sometimes it will kick in by itself but majority of the time I have to trip it. I have changed the batteries cleaned the thermostat,and reset it. Is it time for a new thermostat and can I replace it myself. Thanks