Bacharach | THE MEASURABLE DIFFERENCE | New Kensington, PA, USA | Dublin, Ireland | Toronto, Canada | mybacharach.com
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Troubleshooting Guide
Deciphering the HGM MZ faults and numeric codes
Depending on the nature of the fault, the HGM-MZ may or may not continue to operate normally. Under
a non-critical fault condition, the HGM-MZ will continue to measure and log data, but some peripheral
functions may be compromised.
Under a critical fault condition, action is required for the HGM-MZ to operate normally. The table on the
following page lists the various fault conditions and explains what action should be taken to correct the
problem. The fault codes are cumulative, for example a code “4200” although not shown below is
actually individual codes 4000 “
REZERO VOLT TOL
” and a 200 “
GAIN SET FAULT
” combined to
indicate two faults registered at the same time.
Most common fault code is an “1800” which is a combination of a “1000” No flow on purge and an
“800” no flow on zone. A “1000” Fault will usually make an “800” because the zones will not flow as a
result.
Note:
Before any repairs or testing is done it is advisable to put the monitor into “Service Mode” and
then take it back out of service mode to get current Diagnostic information. (See last page for
directions)
Critical Faults
•
NO FLOW ON ZONE (0800)
–
1. Check for a blockage in the air sample line or at the line end filter.
2. Check for kinks or pinch points on e sample line
Note: Once the blockage has been cleared, the HGM-MZ will return to normal operation after
the zone has been sampled.
NOTE:
This can take some several minutes since it is dependent upon how many zones
there are and their lengths.
The HGM-MZ will clear the fault the next time it polls the effected
zone and the HGM-RD will return to normal operation the next time that it polls the HGM-MZ.
