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Third party components
Service manual
360
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
Faulty Waveform.
Possible reasons:
▪
Transmission circuit failure on a PCB.
After checking and correcting possible causes of F1-F2 transmission problems,
perform a communication reset (see
361]).
To check the communication between outdoor units
Q1 and Q2 are connection terminals for the transmission wiring between multi
outdoor units.
1
Measure the voltage as shown below:
VDC
Com.
Ref.
Q1
X37A
13 V DC
Q2
X37A
13 V DC
Q1
X37A
-3 V DC
Q2
X37A
-3 V DC
c
a b
d
a
Terminal Q1
b
Terminal Q2
c
Connector X37A pin 1
d
Connector X37A pin 2
Is the measured voltage correct?
Action
Yes
Return to the troubleshooting of the
specific error and continue with the
next procedure.
No
Perform a check of the main PCB, see
290].
Summary of Contents for VRV IV+
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