Gree GWH18AC-D3DNA1B Service Manual page 45

DIAGNOSTIC CHARTS (CONT.)
Outdoor coil clean? Outdoor coil clean?
Indoor filter clean? Indoor filter clean?
Check indoor fan Check indoor fan
Connect low side gauge Connect low side gauge
at suction service valve. at suction service valve.
Measure discharge temp.* Measure discharge temp.*
Non condensables Non condensables
in sys. Pump down in sys. Pump down
and recharge unit and recharge unit
* Restriction in system. Check capillary tube and check for damage to liquid line between indoor and * Restriction in system. Check capillary tube and check for damage to liquid line between indoor and
outdoor units. outdoor units.
No No
Yes Yes
No No
Yes Yes
No No
motor motor
Yes Yes
Yes Yes
No No
No No
Normal suction, Normal suction,
high head? high head?
Yes Yes
Unit is overcharged. Unit is overcharged.
Reclaim charge and Reclaim charge and
weigh in correct charge weigh in correct charge
Fig. 36 – Unit Not Running Optimally
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 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 9 * To supplement flow chart 9
** Check for blockage on outdoor coil and drain pan. Are the hol e s in drain pans blocked? ** Check for blockage on outdoor coil and drain pan. Are the hol e s in drain pans blocked?
Fig. 37 – Unit Not Running Optimally (HP in Heating*)
Clean coil. Problem Clean coil. Problem No No
persists? persists?
Yes Yes
Clean filter. Problem Clean filter. Problem No No
persists? persists?
Yes Yes
Replace indoor fan Replace indoor fan
motor. motor.
Check application Check application
limits. limits.
No No
High head, high High head, high
suction? suction?
Yes Yes
No No
Check reversing valve. Check reversing valve.
Go to flow chart 12 Go to flow chart 12
No No
Replace sensor Replace sensor
No No
Beyond operating range Beyond operating range
42
Problem solved Problem solved
Problem solved Problem solved
High head, low High head, low
suction? suction?
Yes Yes
See note below * See note below *
A09368
A09369