New answers tagged


The zone board's gone bad Since upstairs is broken, yet downstairs is fine, and it's not a thermostat issue, I'd point the finger at the zone board having something wrong with it. Just to make sure, try pulling the upstairs thermostat and jumpering R to W on its base; if the heat doesn't come on, then something's dead with the W input for that zone.

Top 50 recent answers are included