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SiBE28-804
Troubleshooting by Remote Controller Display / LED Display
Troubleshooting
231
Evaluation of Abnormal Low Pressure
Abnormally low pressure level is mostly caused by the evaporator side. The following contents
are provided based on field checking of service engineer. Further, the number is listed in the
order of degree of influence.
In cooling operation
In heating operation
Check No.7
Check items (Possible causes)
Judgment
Does the outdoor unit fan run normally?
Visual inspection
Is the indoor unit filter clogged?
Visual inspection
Is there clogging before or after the EV
(capillary)?
Check if there is a temperature difference before
and after EV (capillary).
Check if the main valve unit of EV operates (by
noise, vibration).
Is the check valve clogged?
*Heat pump model only
Check if there is a temperature difference before
and after check valve.
→
If YES, the check valve is caught.
Is the LPS normal?
Check continuity using a tester.
Is the indoor unit installed under such conditions
that short circuit easily occurs?
Visual inspection
Is the refrigerant gas short?
Conduct refrigerant collection and vacuum
drying, and then add proper amount refrigerant.
Check items (Possible causes)
Judgment
Does the outdoor unit fan run normally?
Visual inspection
Is the outdoor unit heat exchanger clogged?
Visual inspection
Is the outdoor unit installed under such
conditions that short circuit easily occurs?
Visual inspection
Is there clogging before or after the EV
(capillary)?
Check if there is a temperature difference before
and after EV (capillary).
Check if the main valve unit of EV operates (by
noise, vibration).
Is the check valve clogged?
Check if there is a temperature difference before
and after check valve.
→
If YES, the check valve is caught.
Is the LPS normal?
Check continuity using a tester.
Is the refrigerant gas short?
Conduct refrigerant collection and vacuum
drying, and then add proper amount refrigerant.
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 ...