Honeywell RTH5100B Thermostat
The thermostat upgrade is a very common upgrade and lots of information is available on this forum. I wanted to add the specific model I used for others that may be searching. Honeywell RTH5100B 1...
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DuoTherm (Dometic) uses two relays for fan control on these boards- the brown fan lead switches power to the fan- this must be connected or the fan will not run. The blue high fan relay simply toggles between high and low fan, so you hook the brown wire to the new fan circuit, the blue wire will connect to this circuit via a simple switch to combine the two.
