Self-Diagnostic System; Mcii Tempatrol® Check System Warnings - Delfield Shelleymatic ACR-26S Service And Installation Manual

MCII Tempatrol ® Self-Diagnostic System
Check system indications
Whenever a CHECK SYSTEM indication
appears, a potentially serious problem has
occurred. Appropriate action should be taken
CAUTION
immediately to ensure proper product temper-
ature is maintained. A qualified service agent
should be called whenever a serious problem
has occurred.
You may be able to speed up the repair process, however, by
noting the diagnostic codes provided on the digital display by
the MCII when a problem occurs.
Using the diagnostic mode
Using the following instructions, enter the diagnostic mode
and write down the codes to give to your service agent.
1) To enter the diagnostic mode, press DOWN and
TIME simultaneously, then press TEMP.
2) The diagnostic code numbers and CHECK
S T P E S
SYSTEM indicator should appear. If there is more
than one code number, the unit will display them
one after another, repeating the sequence continu-
ously. By using the chart provided on page 12, you
can determine the problem area or areas to check.
MCII Tempatrol ® Check System Warnings
For customer service, call (800) 733-8829,
10
(800) 733-8821 or (517) 773-7981
3) To exit the diagnostic mode, press RESET.
The CHECK SYSTEM indicator will go out
unless there is a sensor problem. The CHECK
SYSTEM indication will reappear in one hour if
an over-temperature condition still exists.
The diagnostic codes are provided for information only; ser-
vice should be left to qualified service agents only!
Clearing error codes
After the unit is repaired, the error code or codes must be
erased from the MCII. Otherwise, they will be stored and
any new errors will be added to the old list, making diagno-
sis of potential future problems difficult. Follow these steps to
erase all error codes from the MCII:
1) Press the TIME and DOWN buttons simulta-
neously, then press the TEMP button.
2) Press the DEFROST button. The condensing
S T P E S
unit will shut off, and the display will read 000.
3) Press UP until the display reads 08.
4) Press the TIME button. The display will blink to
indicate the command has been executed.
5) Press RESET. The condensing unit will
restart, and the display will return to the
cabinet temperature.
(Reference Chart)