Electra DELTA 18, Service Manual

Page: 76 / 110

12-34
CONTROL SYSTEM
SM DELTA 1-E.0 GB
12.2 System Diagnostics
Pressing Mode button for 5-10 seconds in SB or any other operation mode will activate
diagnostic mode by the acknowledgment of 3 short beeps and lighting of COOL and
HEAT LEDs.
In diagnostic mode, system problems will be indicated by blinking of Heat & Cool LEDs.
The coding method will be as follow:
Heat led will blink 5 times in 5 seconds, and then will be shut off for the next 5 seconds.
Cool led will blink during the same 5 seconds according to the following table:
No Problem ○ ○ ○ ○ ○
1 RT1 is disconnected ○ ● ● ● ●
2 RT1 is shorted ○ ● ● ● ○
3 (Reserved) ○ ● ● ○ ●
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 ● ○ ○ ○ ○
○ - ON, ● - OFF
Notes:
1. If faults occur in more than one thermistor (except case number 12 on the
table above), only one fault will be indicated according to the following order:
RT3, RT2, RT1.
2. A/C will jump out to normal mode if sending a command by the R/C in the
system diagnostics mode. If this command from the R/C contain a Group ID, this
ID will become the new Group ID of the ELCON unit.