Have an intertherm E3EB-015H centeral heater and Honeywell therm. Turning the fan ONLY on doesn't work. There is a grey wire in the heater unit not hooked up and two wires (blue and yellow) from the thermostate in the heater not hooked up. HELP!
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Check to see if the fuse is blown. If it apprears to be blown, replace it. It is inexpeisive and simple. If you locate the fuse, you will be abel to determin if it is blowin becuase you will be erruption or a burnt mark in the fuse wires.
It sounds to me like you have a transformer that is going to need replaced before too long.It is normal for a transformer to make a low humminig/buzzing sound that you describe but as they get older sometimes they get quite loud.The good thing is they are not hard to replace nor are they very expensive.
I have seen them just be loose on their mounting screws and you might get by just tracing the sound down and tightening the screws. Thank you and good luck.
Make sure fan relay is wired correctly (G) wire. Ensure the fan on therm is not on, it should be on Auto or off.
If your furnace is short cycling because it has to keep heating your home, the delay in the control board may be staying on to compensate for the exchangers getting hot. If it heats normally, then put your attention to your thermostat.
Set the heating system on aux heat only. Fan should not be on, if it does stay on after a heating cycle, see if the furnace is heating normally, and reaching temp as desired before the heat comes off. Then check the therm wiring, pull the face of the therm, disconnect green wire (fan) and try the heating again.
Red= power........White=heat.............Green=fan.................(grey)-(yellow)=cool .....these are the connectons. Disconnect these wires from the thermostat and know that red/power is the only wire that send power to the thermostat, and the rest sends it back to the unit to call for whatever,, red--to . white for heat... red to green for fan .... &red to grey for cool! OK! Turn all your power on, and use a jumper wire from red / green for fan and see if the fan comes on! Then move the jumper wire from red to green , to red / to white for heat and the fan , wait for 3 minutes before removing and going to the next step. Then red /to grey for cool and check if the outside comes on. Either you have a wire touching past the insulations and making a connection, a bad thermostat ,oe excessive wire lead touching the next connection.Thank you very much!