Carrier High Wall Duct Free Split System 38MVC Service Manual page 34

CHART 9 - - UNIT NOT RUNNING OPTIMALLY (HP IN HEATING)*
Visually check outdoor Visually check outdoor
Unit for ice blockage. ** Unit for ice blockage. **
Yes Yes
Check defrost sensor. Ok? Check defrost sensor. Ok?
Go to flow chart #2
Yes Yes
Check application limits. Check application limits.
Ok? Ok?
Yes Yes
Check ambient conditions. Check ambient conditions.
Prime icing? Prime icing?
Yes Yes
Explain to customer Explain to customer
* To supplement flow chart #8
** Check for blockage on outdoor coil and drain pan. Are the holes in drain pans blocked?
No No
Check reversing valve. Check reversing valve.
Go to flow chart #12
No No
Replace sensor Replace sensor
No No
Beyond operating range Beyond operating range
34
es in drain pans blocked?
A08184