Lennox heat pump coils are frozen, turned off and they defrosted, powered on and they froze again. Ambient temp in Seattle is above freezing. Control board has been previously replaced. Previous lockout problems have been fixed by power cycling, but never had frozen coils.
E421 error code - W outdoor wire, mis-wire fault.
Fix - clears once voltage not sensed on output or power cycled.
Have turned off breaker but unit is still powered to point where error led is on.
How do I fully power cycle? Where LED goes off, assume some capacitor is powering..??..
Other possible DIY fixes? Competent in measuring voltage across terminals, need direction.
E421 error code - W outdoor wire, mis-wire fault.
Fix - clears once voltage not sensed on output or power cycled.
Have turned off breaker but unit is still powered to point where error led is on.
How do I fully power cycle? Where LED goes off, assume some capacitor is powering..??..
Other possible DIY fixes? Competent in measuring voltage across terminals, need direction.