Daikin RZQ100B8V3B Service Manual page 163

ESIE05-03
Troubleshooting
Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be
occurred.
Part 3 – Troubleshooting
Measure the temperature of
suction air and supply air.
Temperature difference =
Suction air temp. Supply air
temp.
Temperature
YES
difference for cooling should
be between 8 and
18 C.
NO
Does
any frost
generate around inlet
YES
port of indoor unit heat
exchanger or outlet port
of expansion
valve?
NO
Does
YES
indoor unit air flow rate
down?
NO
Is the
level of high YES
pressure higher than
normal level?
NO
Possible causes as follows
* Insufficient compression
of compressor
* Insufficient circulation
of refrigerant
* Faulty expansion valve
Does the
YES
heat load increase
after installation
of the unit?
NO
Possible causes as follows
* Incorrect selection of model
* Affection of direct sun
Is the
operation current
less than specified
YES
level?
NO
Gas shortage possibly
generates trouble.
* Clogged air filter
* Soiled heat exchanger
* Malfunction of fan motor
(Refer error code A6 .)
Possible causes as follows
* Refrigerant overcharge
* Air in refrigerant system
* Soiled heat exchanger
* Short circuit of supply air
* Disturbing item in air flow
* Malfunction of fan motor of
outdoor unit
(Refer error code E7 .)
Troubleshooting
Normal.
Additional unit installation
should be considered
After vacuum drying, charge
correct amount of refrigerant.
Check each section
Check each item
Check each item
(S1994)
3–15
1
3 3
4
5