GVZC20 Service Manual

SERVICING

INDOOR UNIT TROUBLESHOOTING FOR TXV APPLICABLE UNIT (MBVC**00AA-1)

7 SEGMENT LED

(characters will alternate)

DESCRIPTIONOFCONDITION

(nodisplay) INTERNAL CONTROL FAULT / NO POWER

On STANDBY, WAITING FOR INPUTS

Ec HEATER KIT TOO LARGE, TOO SMALL, OR NO MATCH

E5 FUSE OPEN

EF AUXILIARY SWITCH OPEN

d0 DATA NOT ON NETWORK

d1 INVALIDDATAONNETWORK

d4 INVALID Bluetooth® SHARED DATA LOADER BTSDL01 DATA

b0 BLOWER MOTOR NOT RUNNING

b1 BLOWER MOTOR COMMUNICATION ERROR

b2 BLOWER MOTOR HP MISMATCH

b3 BLOWER MOTOR OPERATING IN POWER, TEMP. ,OR SPEED LIMIT

b4 BLOWER MOTOR CURRENT TRIP OR LOST ROTOR

b5 BLOWER MOTOR ROTOR LOCKED

b6 OVER/UNDER VOLTAGE TRIP OR OVER TEMPERATURE TRIP

b7 INCOMPLETE PARAMETER SENT TO MOTOR

b9 LOW INDOOR AIRFLOW

C1 LOW STAGE COOL - LEGACY MODE ONLY

C2 HIGHSTAGECOOL-LEGACYMODEONLY

P1 LOW STAGE HEAT PUMP HEAT - LEGACY MODE ONLY

P2 HIGH STAGE HEAT PUMP HEAT - LEGACY MODE ONLY

h1 EMERGENCY HEAT LOW - COMMUNICATING MODE ONLY

h2 EMERGENCY HEAT HIGH - COMMUNICATING MODE ONLY

FC FAN COOL - COMMUNICATING MODE ONLY

FH FAN HEAT - COMMUNICATING MODEONLY

F FAN ONLY

H1 ELECTRIC HEAT LOW

H2 ELECTRIC HEAT HIGH

DEFROST - COMMUNICATING MODE ONLY

(Note: defrost is displayed as H1 in a legacy setup)

GREEN CFM LED-EACH FLASH REPRESENTS 10CFM

(USE FOR AIRFLOW APPROXIMATION ONLY) - EXAMPLE: 8 FLASHES = 800CFM