Diagnostics Menu
74 CVHE-CLD-1A
Max Acceleration Setpts
Error
IFW Starter All a. The redundant Maximum Acceleration
settings did not agree for 30 contiguous
seconds. (Continue to use the previous value for
the 30 second timeout.) When this diagnostic
occurs the affected Starter Module shall use 6
seconds as a default until either the UCM is
reset or, if the redundant settings agree again,
the starter module can go back to using the
actual setting.
Review Max
Acceleration Set
Up
Max Pumpout Rate Exceeded-
Svc (Prg)
IFW Purge All a. IFW to the chiller, MAR to the Purge. Purge Inop: See
Purge O & M
Manual
Max Pumpout Rate Exceeded
(Prg)
IFW Purge All a. IFW to the chiller, MAR to the Purge. Purge Inop: See
Purge O & M
Manual
Memory Error Type I: NOVRAM MMR Chiller On UCM
Power Up
or
following
a Type II
Memory
error
diag.
a. On UCM either power up or following a Type II
Memory Error a NOVRAM memory error was
detected. The UCM is operating on all
Engineering Factory defaults for all setup
parameters. Check all setup parameters and
continue to run chiller. Replace the Chiller
Module as soon as a replacement is available.
Note: It is expected that this diagnostic will be
detected on the very first power up of the Chiller
Module at the Manufacturer since the NOVRAM
will not contain valid data on first power up.
Call Service to
Check all
Settings
Memory Error Type IV IFW Chiller All A page timeout error was detected while trying to
write data into EEPROM. There will likely be a
recall of Engineering Factory defaults on the
next reset or power transition. Replace the
Chiller Module as soon as a replacement is
available.
Call Service to
Check all
Settings
Memory Error Type II: Shadow
RAM
IFW Chiller All a. A Shadow RAM memory error was detected.
The UCM is operating on all last valid values
(pulled from NOVRAM) for all setup parameters.
No setup parameter changes were pending to be
loaded into NOVRAM, a complete recovery of all
setup parameters was made and there is no
need to check unit setup parameters.
Compressor starts and hour were lost for not
more than the last 24 hours. This is expected to
be an isolated event and repair or replacement is
not required. If this diagnostic does occur
repeatedly, then replace the Chiller module.
No Settings
Were Lost
Memory Error Type III IFW Chiller All a. A Shadow Ram memory error was detected.
The UCM is operating on all last valid values
(pulled from NOVRAM) for all setup parameters.
Setup parameter changes less than 24 hours old
pending to be loaded into NOVRAM were lost.
Check all setup parameters made in the last 24
hours. Compressor starts and hours were lost for
not more than the last 24 hours. This is expected
to be an isolated event and repair or
replacement is not required. If this diagnostic
does occur repeatedly, then replace the Chiller
module.
Settings
Changed in The
Last 24 Hours
Lost
DIAGNOSTIC DESCRIPTION
Diag
Type
Module
that
Called
Diag.
Diag.
Active
Modes
CAUSE Help Message
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