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View Full Version : Honeywell th 221 b not turning on the heater


fastchevy
Nov 28, 2009, 06:22 PM
I have 2 wires comeing out of the wall one is white and one is red I hook them up but the boiler doesn't turn on

hvac1000
Nov 29, 2009, 02:27 AM
Hook one to R or RH and the other to W. If that does not work then hook the two wires directly together and see if it runs. If it does then there is a problem with the thermostat

KC13
Nov 29, 2009, 07:13 AM
If you can post a few pics of the boiler, it would help in determining what you have & probable culprits.