I have the round digital honeywell thermostat. Usually I switch the little knob to "heat" and the other one to "fan" and press the up button to increase to desired heat, the hot air comes out. Yesterday, I did the same thing and it isn't working anymore. I just feel the cold air coming out of the vent. I've been messing around the set button but still nothing. Please help.
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I imagine its only 2 wires? These are for the thermostat. By joining them together, you are bypassing the on / off and the temperature control. Without knowing the actual wiring diagram on these its pretty hard to say but there should be 2 (or more) connections. 1 will be the common and the other one will only activate when the unit is on or the temperature is higher than you have selected. By turning the temp knob around , you should hear he switch click on / off. A multimeter will determine which is the switching contacts. the thermostat may be faulty. You may need to purchase a replacement.
There could be a number of issues associated with this issue. #1 bad thermostat, #2 no low voltage from the furnace or air handler, #3 if gas furnace, no pilot(standing pilot units or bad ignition system). If you have a fan switch on the thermostat turn it to on and see if the blower comes on. I would also check to make sure the breaker is turned on. Over the years I have found many things that all have the end result you are seeing. I just named a few things you can try.
Are you changing out thermostat? If so you must turn off power to your furnace or air handler. You should mark or write down each color and what terminal it was removed from. example= red from term r=green from term.=g yellow from y... Be careful, some thermostats are wired different according to type of system you have. Heat pumps are different than straight cools and the thermostats sometimes have setting or little switches. Honeywells have installer set up guides in package. Read it carefully
The problem is not your thermostat. It is the person who told you that your AC would be your sole source of hot water. The purpose of heat recovery is to ASSIST with hot water production and reduce the current used by your water heater. The only time your AC heats your water is when it is working to cool (or if it's a heat pump, cool and heat) your home. Turn your water heater back on and let your AC help keep the water hot. It's not supposed to do it alone.
Turn the power off to the Air handler unit.
Remove the thermostat from the wall, (Just the face part).
Look on the back side of the thermostat and verify that the jumpers are set to electric and not gas, otherwise the fan will not run during heat mode, they come from the factory usually set for gas.
If this is a electric heater this will solve your problem, If it is gas then it will be more detailed. Once you put it back on keep in mind that most thermostats have a 3-5 minute delay so just give it a little time and the fan should then work once you have the jumpers in the correct position.
The switch on the right side of the T87 is for the fan. Down is the auto position which will cause the fan to run only when needed. Up is the always-on position, used to circulate the air constantly. If you want to shut down all heating cooling associated with this thermostat you need to look at the switch on the left side of the stat. To the right is heating, center is OFF, and left is ac.