||11-04-2012 08:06 AM
I need some help troubleshooting, my heat pump stopped working last night
Last night at about midnight my wife noticed the thermostat was flashing something. I took a look at it and it said "E2" in between displays of the temperature. The thermostat is a Bryant TSTATBBNHP01-C. According to the manual that is a "Low Voltage Fault". I was too tired to dig into it at that point so I took the easy way out. I replaced the filter and cycled all the breakers and went to bed hoping that it was a fluke. This morning the house is COLD (no surprise). So I got out the manuals and dug a little deeper.
The thermostat is no longer flashing the E2 code. It just says that the heat is On, and set to 71 (although the house is currently 63 and falling). It also says the e-heat is on (quite possible because it's 35 out this morning). I also toggled the manual Fan function and the fan did not come on.
The air handler is a FV4BNF002 and I think the outside unit is a 650A but I need to double check (if it matters). I took the thermostat off the wall and got out my multimeter and I have no voltage between R and C (I read on another site to check that). I also checked at the air handler and got no voltage between R and C. If I understand that correctly that means that for some reason my air handler has shut down, most likely a fault of some sort. I'm not sure what to check next. I don't think this unit has an LED for trouble codes (haven't seen one anyway). What are the most likely causes of no voltage at R and what do I look for?
Thanks in advance for any help you can give me.