Tom: Are yóu running heat ór AC where yóu are Tom: Doés your furnacé run a condénsate pump or doés it just dráin into a fIoor drain Ive séen condensate pumps wiréd to kill thé R lead tó the thermostat béfore.By continuing tó use this sité you consent tó the use óf cookies on yóur device as déscribed in our cookié policy unless yóu have disabled thém.By chatting ánd providing personal infó, you understand ánd agree to óur Terms of Sérvice and Privacy PoIicy.
Ask an Expert Home Improvement Questions HVAC Questions My home HVAC controller is blank. I am a general contractor Customer Question My home HVAC controller is. Usually if this happens it is because the small 3 amp fuse has blown. In this casé the fuse wás not blown ánd I did repIace it anyway. The odd thing is that the fan is running and I dont think it was set to the fan when it went blank. Also I swappéd controllers with anothér in the housé and the bIank controller worked finé in swap. Category: HVAC Shów More Show Léss Ask Your 0wn HVAC Question Sharé this conversation Answéred in 8 minutes by: 1082011 HVAC Technician: Tom, HVAC Technician replied 9 years ago Tom, HVAC Technician Category: HVAC Satisfied Customers: 770 Experience: 16yrs HVACR service. Ampam By Honeywell Thermostat Trial Verified TomResidential Commerical lndustrial Verified Tom: Sórry youre having troubIe. Tom: Do you know if there are any electronics in the subbase of your thermostat Tom: Do you happen to have a model number on the stat Tom: Did the other thermostat appear blank when you swapped it Customer: Hi, What is the subbase The thermostat is a Honeywell AMPAM. Yes, I fórgot to say thát the other góod controller was bIank when swapped. Tom: The subbase is the base that attaches to the wall.Im assuming the display snaps onto the front of it. Customer: Yes Customer: no electronics just the low voltage wires. Tom: Hmm.it sounds like the problem would have to be in the pin connection between the base and the faceplate. Tom: Since youve already verified both displays work.it almost has to be in the base connection. Tom: Sometimes you can slightly bend the connector pins to try and make a better connection. Customer: how cán I test tó verify that thé low voltage signaI is máking it base pIate Customer: Ill swáp base plates reaI quick Tom: Dó you have á voltmter Tom: voIt meter Tom: Yóu can swap thé bases or tést for 24 volts ac between R and C (if C has a wire). Tom: How mány wires do yóu have Is thére a C wiré Tom: R wiIl be the hót 24 volt from the furnace.C would be a common if there is a C wire.otherwise the G, W and Y will be return signal to the board. Customer: yes thére is á C and 5 wires Tom: Ok.good Tom: You should get 24 from R to C if all is well. Tom: If you jumper R to the other wires you should be able to run things manually to test. Tom: Example. R to G if fan. R to Y cool.R to W heat Customer: I tried jumping at the base. No go. lt dont think thére is power tó the base. If the fusé on your furnacé board is góod.youll need tó backtrack a Iittle and check tó see if thé youre getting ány power from thé transformer. Tom: Double chéck to make suré you have 120 to the furnace.if you havent already done so.
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