Symptom-Based Troubleshooting; Overview - Daikin RZQ Series FCQ20EVA Service Manual

SiME281501E

2. Symptom-based Troubleshooting

2.1

Overview

Symptom
1 Equipment does not operate.
2 Indoor unit fan operates, but compressor does
not operate.
3 Cooling/heating operation starts but stops
immediately.
4 After unit shuts down, it cannot be restarted for a
while.
5 Equipment operates but does not provide
cooling.
6 Equipment operates but does not provide
heating.
7 Equipment discharges white mist.
8 Equipment produces loud noise or vibration.
9 Equipment discharges dust.
10 Remote controller LCD displays "88".
11 Equipment emits odor.
12 Flap operates when power is turned ON.
13 Change of operation mode causes flap to move. It is normal.
14 Fan operates in "M" tap during heating even if
remote controller is set to "L" tap.
15 Flap automatically moves during cooling.
16 Indoor unit fan operates in "L" tap for 1 minute in
"program dry" mode even if compressor is not
operating.
17 Indoor unit fan operates after heating operation
stops.
18 Drain pump operates when equipment is not
operating.
19 Horizontal swing sends air to different directions
in cooling and heating even if it is set to the same
position.
20 Flap remains horizontal even if it is set to swing
mode.
21 When operating in remote control thermostat, the
thermostat turns OFF before temperature of
remote control reaches the set temperature.
Service Diagnosis

Symptom-based Troubleshooting

Details of Measures
Refer to P.75
Refer to P.76
Refer to P.77
Refer to P.78
Refer to P.80
Refer to P.81
Refer to P.82
Refer to P.83
Refer to P.84
Refer to P.84
Room smell and cigarette odors accumulated
inside the indoor unit are discharged with air.
Inside of the indoor unit must be cleaned.
It is normal.
The flap initializes for accurate positioning.
There is a control function that moves the flap
when operation mode is changed.
It is normal.
It is caused by the activation of the overload
control (airflow shift control).
It is normal.
It is caused by the activation of the dew
condensation prevention function or ceiling
soiling prevention function.
It is normal.
The monitoring function forcibly operates the fan
for 1 minute.
It is normal.
The fan operates in the "LL" tap for 60 to 100
seconds to dissipate the residual heat in the
heater.
It is normal.
The drain pump continues to operate for several
minutes after equipment is turned OFF.
It is normal.
The airflow direction in cooling/dry operation is
different from that in heating/fan operation.
It is normal.
The flap does not swing in the thermostat OFF
mode.
It is normal.
The thermostat may be controlled with the
suction air temperature (body thermostat),
concurrently with the set temperature.
74