Daikin REYQ-TA Series Service Manual page 256

Troubleshooting by Error Code
Troubleshooting
∗1. Make measurement of voltage at the power supply terminal block (X1M).
Note:
∗2. Make measurement of voltage at the L1, L2 and L3 terminals of diode module located on the
243
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Check in Monitor Mode
8-14 ton classes are equipped
with 2 compressors.
Check for the compressor 1 or 2
applicable to the error code P1
while in monitor mode of the
outdoor unit PCB.
Is supply
voltage imbalance
over approximately
12 V? (∗1)
NO
Is the
imbalance of voltage
applied to the inverter over
approximately
12 V? (∗2)
NO
Even though the power
supply voltage is normal, the
error recurs.
∗ Use the document "Notice of Inspection Results" attached to spare part.
Explanation to users
Hand the "Notice of Inspection Results" to user to ask
him/her to rectify the imbalance.
inverter PCB during the compressor is in operation.
YES
Open phase?
NO
YES
<If voltage can be monitored>
Use equipment capable of constantly
recording power supply voltages (e.g.
Memory Hicoder) to record power
supply voltages between phases (R-S,
S-T, and R-T) for a period of
consecutive 1 week.
Power supply voltage imbalance
Even though power supply voltage
remains balanced when making
measurement, it often becomes
imbalanced during night-time (from
18:00 to 22:00).
Take countermeasures.
Be sure to explain user that "power supply
voltage imbalance" will occur and Daikin
accepts no responsibility for the imbalance.
SiUS371614E
YES
Correct the open phase of
power supply.
Rectify the power supply
voltage imbalance.
Take countermeasures (listed
below).
Defective noise filter, magnetic
relay, or wiring
Turn OFF the power supply,
and then check and repair
wirings in the main circuit and
defective components.
(1) Loose contact and wiring
disconnection between the
power supply and the
inverter
(2) Adhesion, meltdown, or
loose contact of magnetic
relay
(3) Wiring disconnection in or
loose contact of noise filter
Replace the inverter PCB.
REYQ72TA: M1C
REYQ96-168TA: M1C, M2C
Service Diagnosis