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SiBE28-804
Troubleshooting by Remote Controller Display / LED Display
Troubleshooting
219
5.40 “
UF
” Malfunction of Transmission between Indoor and
Outdoor Unit / Piping and Wiring Mismatch / Gas
Shortage
Remote
Controller
Display
UF
Applicable
Models
RZQ(S)71~140
Method of
Malfunction
Detection
Check the transmission between the indoor and outdoor units with a microcomputer when the
power turned ON.
Detect by checking the following temperature differences during compressor operation.
A: Difference in temperature detected by the indoor heat exchanger thermistor (R2T) and
the indoor suction air thermistor (R1T)
B: Difference in evaporation temperature (Te) (or condensation temperature (Tc) during
heating operation) detected by the indoor heat exchanger thermistor (R2T) and the
compressor sensor
Malfunction
Decision
Conditions
When the inter-unit wiring between the indoor and outdoor units is incorrect
When the following conditions continue for 20 minutes during compressor operation
A: R2T – R1T < 4ºC, and
B: R2T – Te (or Tc during heating operation) > 14ºC (24ºC during heating operation)
Supposed
Causes
Faulty inter-unit wiring between the indoor and outdoor units
Mismatching of wiring and piping
Refrigerant shortage (out of gas)
Clogged refrigerant piping system
Troubleshooting
Does
"
UF
" appear when the
power is turned
ON?
YES
NO
Correctly connect
inter-unit wiring
between the indoor
and outdoor units.
The phase of inter-unit wiring
between the indoor and
outdoor units is incorrect.
Is the
connection of inter-unit
wiring and piping between the
indoor and outdoor units
matched?
NO
YES
YES
Match the connection
of the inter-unit wiring
and piping between
the indoor and
outdoor units.
Is the refrigerant
level proper?
NO
Recharge a proper
amount of refrigerant
after refrigerant
collection and vacuum
drying.
(P232)
Check the refrigerant
piping system for
clogging.
Check 13
Check 8
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Summary of Contents for FHQ100BUV1B x 2
Page 13: ...SiBE28 804 2 ...
Page 19: ...Model Name and Power Supply SiBE28 804 8 General Information ...
Page 29: ...Specifications SiBE28 804 18 Specifications ...
Page 33: ...Wired Remote Controller SiBE28 804 22 Remote Controller 1 2 Installation ...
Page 34: ...SiBE28 804 Wired Remote Controller Remote Controller 23 ...
Page 93: ...Outdoor Unit Fan Speed Control SiBE28 804 82 Functional Description ...
Page 131: ...Test Run and Operation Data SiBE28 804 120 Test Operation ...
Page 251: ...Troubleshooting by Remote Controller Display LED Display SiBE28 804 240 Troubleshooting ...
Page 277: ...PCB Layout SiBE28 804 266 Appendix ...
Page 297: ...RZQ100 140C7 RZQS125 140C7V1B SiBE28 804 286 Removal Procedure ...
Page 311: ...SiBE28 804 iv Index ...