How to respond to a freeze protection fault and coil freeze-up on a Greenheck RV / RVE / IGX make-up air unit
A freeze protection lockout almost always means cold outdoor air reached the coil before the burner raised the air temperature. Check the outdoor air damper end-switch and burner ignition sequence before resetting the freeze stat.
~60 min6 steps
How to restore inadequate heating output on a Greenheck RV / RVE / IGX make-up air unit in cold weather
A MAU that cannot meet discharge temperature on cold days usually has a gas supply issue, a failed igniter, or a fouled heat exchanger. Check gas pressure at the unit first before opening the burner section.
~60 min7 steps
How to diagnose supply fan vibration and belt wear on a Greenheck RV / RVE / IGX make-up air unit
Fan vibration and squealing almost always come from a slipping or worn belt. Check belt tension and condition first. If the belt is good but vibration continues, check the fan wheel for accumulated dust or debris.
~45 min7 steps