Honeywell RTH2300B won't turn on my boiler system and flashes "return"

sdskala Posts: 1, Reputation: 1

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Nov 6, 2011, 04:05 PM

Honeywell RTH2300B won't turn on my boiler system and flashes "return"

Only two wires, one black and one white, are left over from my old digital thermostat. The white wire is attached to W and the black wire to O/B. Won't turn on the baseboard hotwater zone although it says HEAT ON zone and flashes RETURN. What Now?

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