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888 Porter Rd. Muskegon, MI 49441 Phone: 231.798.8888 Fax: 231.798.4960 www.structuralconcepts.com
JOHNSON CONTROL - MR3CCUHV
Error Code System Status
F1
Indicates an open or shorted temperature sensor
Alarm output is on. Compressor runs according
to the sensor failure mode selected (parameter
SF).
Cycle power to reset control.
F2
Indicates an open or shorted evaporator sensor
Alarm output is on. Defrost cycle is controlled
by parameters di (defrost initiation) and dd
(defrost duration). Correct problem to reset con-
trol.
A1
Indicates that the digital input was open for longer
than the time delay (id) and digital input (iF) Option
1 is selected
Compressor output is off. Alarm output is on.
Correct problem to reset control.
A2
Digital input closed for longer than time delay (id)
and digital input (iF) Option 2 is selected
Alarm output is on. Correct problem to reset
control.
A3
Digital input open for longer than the time delay (id)
and digital input (iF) Option 3 selected
Fan output is off. Alarm output is on. Correct
problem to reset control.
HI
Temperature has exceeded the high temperature
alarm value (AH)
Alarm output is on. Correct problem to reset
control.
LO
Temperature has fallen below the low temperature
alarm value (AL)
Alarm output is on. Correct problem to reset
control.
EE
Program failure
Alarm output is on. Other outputs are off. Re-
place control.
Alarm and Fault Codes
These alarm and fault codes will flash on the display when the control detects the following faults:
Table 1: Error Codes and Status