10 - 8 RTHC-IOM-1C
Memory Error
Type III
IFW N/A a. A Shadow RAM memory error was detected. The UCP2 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 occurs repeatedly, then replace the Chiller module.
Settings Changed
in The Last 24
Hours Lost
Memory Error
Type I: NOVRAM
MMR Friendly a. On either power up or following a Type II Memory Error a
NOVRAM memory error was detected. The UCP2 is operating on all
Engineering ROM 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
Momentary
Power Loss
MAR Immediate This protection can be defeated in the Service settings, Field Start-
up Group
Determine Cause
Of Power
Interruption (If
phasing is suspect,
check that line
voltage L1 is in
phase with 24 volt
power to starter
module J2-2 or 4)
MPL Detect
Circuit
Inoperative
MMR Friendly A failure was detected in the Momentary Power Loss detect circuit. If
there are no zero cross interrupts on Vab for 637.5 msec The timer
interrupt will trip and generate a diagnostic that indicates that our
ability to detect MPL is gone.
Suspect Starter
Module Hardware
Failure or Miswiring.
See
Troubleshooting
Service Bulletin
No Diff Rfgt
Press, Cold Cond
Water
MMR Immediate The chiller module has detected the 7.7 psid to be open after 20
seconds from the time the unit entered the “starting Mode.”
Check Condenser
Water Temp Too
Low
Options: Loss of
Comm with
Chiller
IFW N/A The options module lost communications with the Chiller module for
15 continuous seconds.
Check IPC Wiring/
Connections
Options: Loss of
Comm with
Starter
IFW N/A The options module lost communications with the Starter module for
15 continuous seconds.
Check IPC Wiring/
Connections
Options Mod Off-
Brd 5V Range
IFW N/A An improper Off Board 5v voltage was detected at the Options
Module. A 5Vdc is used for off-board devices such as the External
CWS and CLS, and pressure transducers. The micro checks to see
that the A/D value falls within an acceptable range.
Check Options
Module Voltages
Options Mod Ref
Voltage
Calibration
IFW N/A An improper reference voltage was detected at the Options Module.
A 2.5 Vdc reference is used to calibrate the non-ratiometric analog I/
O such as 2-10Vdc and 4-20ma inputs as well as PWM Analog
outputs. The micro checks to see that the A/D value falls within an
acceptable range.
See
Troubleshooting
Service Bulletin
Outdoor Air Temp
Sensor
(Outdoor Air
Reset Selected)
IFW N/A Open or Short
a. Use end of range value (whatever value the open or short gives).
b. Clear diag. when the resistance returns to normal range.
Check Sensor,
Wiring And
Connections
Outdoor Air Temp
Sensor
(Outdoor Air not
selected.)
None N/A Open or Short
a. Display end of range value. (dashes “-----”)
N/A
Diagnostic
Description
Diagnostic
Type
Shutdown
Action
Cause Help Message
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