Gree GWH18AC-D3DNA1B Service Manual page 44

DIAGNOSTIC CHARTS (CONT.)
Replace compressor Replace compressor
* Remove screws, remove heat sink, remove thermal grease. Apply new thermal grease and reassemble. * Remove screws, remove heat sink, remove thermal grease. Apply new thermal grease and reassemble.
** Check if voltage between power module P and N is too low and if current is too high. In normal conditions, ** Check if voltage between power module P and N is too low and if current is too high. In normal conditions,
voltage between P and N should be about 370V. voltage between P and N should be about 370V.
No No
Reset circuit breaker. Is unit Reset circuit breaker. Is unit
running? running?
Yes Yes
Problem solved Problem solved
Check voltage and current. Check voltage and current.
Ok? See note below ** Ok? See note below **
Check voltage and balance Check voltage and balance
between any two phases of between any two phases of
U,V, and W. Ok? U,V, and W. Ok?
Replace outdoor board Replace outdoor board
Fig. 34 – IPM Module Protection
Try to start unit using auto Try to start unit using auto
Function. Unit runs? Function. Unit runs?
Yes Yes
Use auto function to Use auto function to
shut off unit. shut off unit.
Start unit using remote Start unit using remote
control. Audible noise heard? control. Audible noise heard?
Unit started? Unit started?
Yes Yes
Problem solved Problem solved
No No
Is there power to outdoor Is there power to outdoor
unit? unit?
Yes Yes
Check input and output on Check input and output on
outdoor board. Ok? outdoor board. Ok?
Yes Yes
Check components. Ok? Check components. Ok?
Flow charts 10 thru 12 Flow charts 10 thru 12
No No
Replace defective Replace defective
component component
Fig. 35 – Unit Not Running, No Diagnostic Code
Check heat sink for Check heat sink for
obstruction and dirt obstruction and dirt
No No
Check if connection Check if connection
is loose is loose
No No
Yes Yes
No No
No No
Check batteries. OK? Check batteries. OK?
Go to chart 13 Go to chart 13
Check wiring and circuit Check wiring and circuit
No No
breaker and fix breaker and fix
No No
Replace outdoor board Replace outdoor board
Yes Yes Check fuse on indoor Check fuse on indoor
board. Ok?* board. Ok?*
Replace fuse Replace fuse
41
Yes Yes
Clean. Clean.
Problem fixed? Problem fixed?
Yes Yes
See note below * See note below *
Is problem fixed? Is problem fixed?
No No
Measure voltage between Measure voltage between
No No
X15 and X9. Ok? X15 and X9. Ok?
No No
Replace capacitor. Replace capacitor.
No No
Problem fixed? Problem fixed?
No No
Yes Yes
Replace indoor board Replace indoor board
Yes Yes Check input and output on Check input and output on
No No
Determine defective Determine defective
component and replace component and replace
A09366
Replace battery Replace battery
No No
indoor board. Ok? indoor board. Ok?
Yes Yes
A09367