Diagnostic Table
RTHC-SVD01B-EN 91
Section 14 Diagnostic Table
14-1. General
There are three diagnostic types listed in the following table. A latching
diagnostic called an MMR will shutdown the entire unit and need a
manual reset to come back on line. A non-latching diagnostic called an
MAR will shut the entire machine down when the condition exists but
will allow the unit to come back on line automatically once the diagnos-
tic has cleared. The third type of diagnostic is informational only, the
microprocessor will let you know that a condition exists but will allow
the unit to operate.
Table 14-1: Diagnostic Types and Action
Diagnostic Type Action Reset
MMR Machine Shutdown Manual Reset
MAR Machine Shutdown Automatic Reset
IFW Informational Warning - no action None required
Table 14-2: Diagnostic Table
Diagnostic
Description
Type/
Shutdown
Action
Module
Calling
Out Diag.
Operating
Modes
Diagnostic is
Active
Cause Help Message
At Speed Input
Opened
MMR
immediate
Starter
1U2
All running
modes
The At Speed input was found opened with
the compressor running after successfully
obtaining an at speed condition. Applies to
solid state starters only
Refer to the solid state
starter service bulletin.
Refer to the starter
module check-out.
At Speed Input
Shorted
MMR
n/a
Starter
1U2
Pre-start The At Speed input was found shorted
before the compressor was started. Applies
only to the solid state starters.
Refer to the solid state
starter service bulletin.
Refer to the starter
module check-out.
Check Clock IFW
n/a
Chiller
1U1
All On loss of power the clock does not keep
time, if there is an extended power loss
(greater than 15 seconds) this diag. is also
generated to alert the operator to check the
clock.
Check Main Power
Supply, Reset Clock
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