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Troubleshooting by Remote Controller Display / LED Display
SiBE28-804
212
Troubleshooting
5.37 “
U0
” Gas Shortage (Malfunction)
Remote
Controller
Display
U0
Applicable
Models
RZQ71~140C7V1B, RZQS71~140C7V1B
Method of
Malfunction
Detection
(In cooling operation)
Detection based on difference in temperature between temperature preset by remote controller
and indoor suction air temperature, motorized valve opening degree, compressor frequency and
low pressure.
(In heating operation)
Detection based on difference in temperature between temperature preset by remote controller
and indoor suction air temperature, motorized valve opening degree during the control of
suction air superheating, high pressure, indoor heat exchanger temperature and indoor suction
air temperature.
Malfunction
Decision
Conditions
(In cooling operation)
When compressor frequency does not increase even though the load is heavy because the
motorized valve is opened to the fullest extent
[If low pressure drops when the compressor is at 41Hz, malfunction is confirmed.]
(In heating operation)
When suction gas superheat degree is large, compressor frequency is low and the motorized
valve is opened to the fullest extent even though heating load is heavy
[If high pressure is lower than saturated pressure for indoor heat exchanger temperature (or
indoor suction air temperature), malfunction is confirmed.]
Supposed
Causes
Refrigerant shortage (out of gas)
Clogged refrigerant piping system
Mismatching of wiring and piping
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 ...