GVZC20 Service Manual
TROUBLESHOOTING
96
Comp discharge temp > 200F
Comp discharge temp < 105F
Comp discharge SH > 70F
Comp discharge SH < 20F
High pressure > 490psi
High pressure SSV< 270psi
High pressure LSV< 270psi
LSV SC > 12F
LSV SC < 4F
Low pressure < 40psi
Requested % demand < Actual %
Requested % demand > Actual %
Repeated stop/start
Weak heating
No switch heating
Noise
Incomplete defrost operation
Stop operation
Sweating liquid line
Liquid stop valve does not fully open
Gas stop valve does not fully open
Line set restriction
Line set length is too long
Blocked filter-dryer
OD EEV coil failure
OD EEV failure
ID EEV coil failure
ID EEV failure
Check valve failure – Leakage
High Pressure switch failure
Pressure sensor failure
Discharge temp sensor failure
Coil temp sensor failure
Defrost sensor failure
Liquid temp sensor failure
Ambient temp sensor failure
OD recirculation
ID recirculation
Dirty OD Heat-exchanger
Dirty ID Heat-exchanger
Outdoor Ambient temp is too high
Outdoor Ambient temp is too low
ID suction temp is too high
ID suction temp is too low
Mixture of non-condensible gas
OD fan motor failure
RV failure
RV coil failure
Over charge
Under charge
Leak
TXV failure
TXV size is small
TXV size is big
ID failure
OD Control Board failure
Compressor failure
Cooling loop is not attached
Cooling loop grease is not enough
Compressor and Gas furnace are operating at the same time
Low ID CFM
A
VOID
CONTACT
WITH
THE
CHARGED
AREA
.
•N
EVER
TOUCH
THE
CHARGED
AREA
BEFORE
CONFIRMING
THAT
THE
RESIDUAL
VOLTAGE
IS
50
VOLTS
OR
LESS
.
1. S
HUT
DOWN
THE
POWER
AND
LEAVE
THE
CONTROL
BOX
FOR
10
MINUTES
.
2. M
AKE
SURE
TO
TOUCH
THE
E
ARTH
GROUND
TERMINAL
TO
RELEASE
THE
STATIC
ELECTRICITY
FROM
YOUR
BODY
(
TO
PREVENT
FAILURE
OF
THE
PC
BOARD
).
3. M
EASURE
THE
RESIDUAL
VOLTAGE
IN
THE
SPECIFIED
MEASUREMENT
POSITION
USING
A
VOM
WHILE
PAYING
ATTENTION
NOT
TO
TOUCH
THE
CHARGED
AREA
.
4. I
MMEDIATELY
AFTER
MEASURING
THE
RESIDUAL
VOLTAGE
,
DISCONNECT
THE
CONNECTORS
OF
THE
OUTDOOR
UNIT
’
S
FAN
MOTOR
. (I
F
THE
FAN
BLADE
ROTATES
BY
STRONG
WIND
BLOWING
AGAINST
IT
,
THE
CAPACITOR
WILL BE CHARGED,
CAUSING
THE
DANGER
OF
ELECTRICAL
SHOCK
.)
Outdoor Normal Temperature Operating Range: 17-62°F / Indoor Normal Temperature Operating Range: 65 - 85°F