Technibel GRV79R5VAA Technical Data & Service Manual page 65

C. Check remote control unit.
• Try to run with another remote
control unit.
First remote control unit is defective.
• Check for residue buildup on
transmitter of remote control unit.
• Check for residue buildup on remote
control receiver on front of indoor
unit.
D. Check fuse on the indoor PCB Ass'y.
• Check fuse on indoor PCB Ass'y
for continuity.
• Check operation lamp to see
if light is ON.
• Measure resistance of primary and
secondary winding of transformer.
• Indoor PCB Ass'y is defective.
E. Check TIMER on the remote control unit.
• Timer is turned ON. Check to see
if or
ON
remote control
OK
If fuse has been blown,
(F)
OK
Light is OFF
(TR)
OK
YES
is displayed on
• Measure resistance of indoor and
outdoor fan motor winding.
• Measure resistance of compressor
motor winding.
• Measure coil resistance of power
relay in outdoor unit.
• Replace the fuse.
Cancel the timer mode.
61
Clean transmitter.
Clean receiver.
(FM)
OK
(CM)
OK
(PR)
OK