Mitsubishi Electric City Multi PFAV-P500VMH-E, Service Handbook

Page: 148 / 242

[
X
Troubleshooting ]
- 139 -
HWE07150 GB
1. Error Code
No response error
2. Error definition and error detection method
ΠWhen no response command is returned although acknowledgement (ACK) is received after transmission, an error is detect-
ed.
ΠWhen the data is transmitted 10 times in a row with 3 seconds interval, an error is detected on the transmission side.
The address/attribute appeared on the display on the remote controller indicates the controller where an error oc-
curred.
3. Cause
1) The transmission line work is performed while the power is on, the transmitted data will collide, and the wave shape will be
changed.
2) The transmission is sent and received repeatedly due to noise.
3) Decrease of transmission line voltage/signal by exceeding acceptable range of transmission wiring.
Farthest:200m [656ft] or less
Remote controller wiring:12m [39ft] or less
4) The transmission line voltage/signal is decreased due to erroneous sizing of transmission line.
Wire diameter: 1.25mm
2
[AWG16] or more
4. Check method and remedy
1) When an error occurs during commissioning, turn off the power sources for the outdoor unit, indoor unit, and LOSSNAY for 5
or more minutes, and then turn them on again.
ΠWhen they return to normal operation, the cause of the error is the transmission line work performed with the power on.
ΠIf an error occurs again, check the cause 2).
2) Check 3) and 4) above.
ΠIf the cause is found, correct it.
ΠIf no cause is found, check 3).
3) Check transmission wave shape/ noise on trans-mission line by following "
X
[3] Investigation of Transmission Wave Shape/
Noise".(page 159)
Noise is the most possible cause of the error "6608".
6608