DIY Home Improvement Forum banner
twinned
1-1 of 1 Results
  1. HVAC
    My furnace has the red light blinking rapidly without a pause. The manual says to: Check for correct line voltage polarity. If units are twinned, check for proper low-voltage (24v) transformer phasing. Any idea's what this means, where do I start. It has been in service for 9 years trouble...
1-1 of 1 Results
Top