Service manual
Table Of Contents
- PXD Series R410A
- LIST OF EFFECTIVE PAGES
- TABLE OF CONTENTS
- INTRODUCTION
- PRODUCT DATA SHEET
- RATING CONDITIONS
- OUTLINE DIMENSIONS
- PERFORMANCE DATA & PRESSURE CURVES
- ELECTRICAL DATA
- WIRING DIAGRAMS
- ELECTRICAL CONNECTIONS
- REFRIGERATION DIAGRAMS
- TUBING CONNECTIONS
- CONTROL SYSTEM
- TROUBLESHOOTING
- EXPLODED VIEWS & SPARE PARTS LISTS
- OPTIONAL ACCESSORIES
- APPENDIX A
- INSTALLATION MANUAL
- PROGRAMMING & OPERATING MANUAL
CONTROL SYSTEM
11-37Revision Y05-01Service Manual - PXD Series
11.16 System Diagnostics
Pressing Mode button for 5-10 seconds in SB or any other operation mode will activate
the DIAGNOSTICS mode, acknowledged by 3 short beeps and lighting of COOL and
HEAT LEDs.
In DIAGNOSTICS mode, system failures will be indicated by the blinking of HEAT &
COOL LEDs.
The coding method is as follows:
HEAT LED blinks 5 times in 5 seconds, and then turns off for the next 5
seconds.
COOL LED blinks during the same 5 seconds according to the following table:
No. Problem 1 2 3 4 5
1 RT1 is disconnected
2 RT1 is shorted
3 RV fault
4 RT2 is disconnected
5 RT2 is shorted
6 (Reserved)
7 RT2 temp reading doesn’t change
8 RT3 is disconnected
9 RT3 is shorted
10 (Reserved)
11 RT3 temp reading doesn’t change
12 RT2 & RT3 temp reading doesn’t change
LEGEND
- ON, - OFF
NOTES
1. If faults occur in more than one thermistor (except case
number 12 in table above), only one fault will be indicated
according to the following order: RT3, RT2, RT1.
2. A/C will return to normal mode when sending a command by
the R/C during system DIAGNOSTICS mode. If the command
from the R/C contains a Group ID, the ID will become the new
Group ID of the ELCON unit.
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