Panasonic R410A Service Manual page 84

4. Mini VRF Alarm Codes
E16 alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example
Notes
E20 alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
1
Check
Correction
2
Example
Notes
Position of serial connector 1
CR-CHX06052
3
4
5
E25 alarm
Alarm code
Alarm meaning
6
Alarm conditions
Probable cause
Check
Correction
Example
Notes
E16
Automatic address setting alarm (too many units)
• The number of indoor units was too many when automatic address setting was performed.
• After initial communications were completed, an unrecognized unit was detected.
(1) The number of indoor unit setting SW (S004) on the outdoor unit PCB is too small.
(2) The inter-unit control wiring is wired incorrectly.
(1) Refer to the test run servicing materials and check the number of indoor units that is set.
(2) Check the inter-unit control wiring at the indoor and outdoor units.
After correcting the indoor unit quantity setting or the inter-unit control wiring, perform automatic
address setting again.
—
—
E20
No indoor units at automatic address setting.
When automatic address setting was performed, no indoor units were recognized.
(1) The inter-unit control wiring from the outdoor unit to the indoor units has been cut.
(2) Serial connector 1 (CN32) is disconnected at the outdoor unit.
(3) The power is OFF at all indoor units in the system.
(1) Check whether the inter-unit control wiring from the outdoor unit to the indoor units is cut.
(2) Check whether serial connector 1 (CN32) is disconnected at the outdoor unit.
(3) Check the power at the indoor units.
(1) Repair inter-unit control wiring from outdoor / indoor units.
(2) Plug connector 1 (CN32) in correctly.
(3) Turn on the power to indoor units.
—
E25
Outdoor unit address setting failure (duplication)
Communication by outdoor unit main-sub control wiring was received that contained the
same address as that unit 5 times or more within 3 minutes.
The unit number is set incorrectly.
Check the unit number again.
Correct the incorrect unit number setting.
—
Recovery from this alarm occurs automatically (when communication that contains the same
address is not received for 3 minutes).
5 - 8
Mini VRF SYSTEM
Trouble Diagnosis
CN32