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FAULT LIST
GSTC fault
displayed
GSP fault code
displayed
Description of fault Troubleshooting
FAULT
NO BURNERS
AVAILIBLE
NBF Once the GS controller detects an ignition
module fail, it will index to the next available
ignition module. If all ignition modules have
failed or there are none available (in the case of
a 100 unit) this fa ult will be generated
-Check red LED’s on all modules for
flashing fault code
-Ensure there is gas supply to the
humidifier
-Ensure that the burn ers have not been
disabled in the software
-Consult factory
FAULT
AIR PROVING
SWITCHXOPEN
WITH
BLOWERS ACTIVE
AOF-X On startup after 3 tries if the AP switch does
not close with in the proving period, this fault
will be generated
-Check that blue hoses on the Air
Proving switch have not come loose.
-Check that wires on the Air Proving
switch are on the N/O contacts
-If available, swap Air Proving switch
with another and see if the fault follows
the air proving switch, if so, replace
switch
-Consult factory
FAULT
AIR PROVING
SWITCH X
CLOSED WITH
BLOWERS
INACTIVE
ACF-X On initial startup if any of the A/P switches are
closed this fault will be generated.
-Ensure that wiring on the air proving
switchisontheN/Ocontacts
-Ensure that there is no continuity
between the switch with the wires off,
if so replace switch
-Ensure that there is not a strong
positive pressure in the room holding
the switch closed
-Consult factory
FAULT
BLOWER X
RPM HIGH
BHF-X If the blower RPM is above the RPM tolerance
for more than 10 seconds, this fault is
generated and the humidif ier stops.
-Check wiring to lead blower and
ensure a good connection.
-Check lead blower for any restrictions
by testing it in the diagnostics screen.
-Consult factory
FAULT
BLOWER X
RPM LOW
BLF-X I f the blower RPM is below the RPM tolerance
for more than 10 seconds, this fault is
generated and the humidif ier stops
-Check wiring to blower X and ensure
a good connection.
-Check blower X for any restrictions by
testing it in the diagnostics screen.
-Consult factory
FAULT
BLOWER X
NOT OP ERATIONAL
BNF-X On startup, if the blower RPM does not exceed
500 RPM within 5 seconds or if during
operation, the RPM drops below 500 RPM for
more than 5 seconds this fault is generated
-Ensure there is power to the blower
and that all wires are making a proper
connection.
-Consult factory
FAULT
ILLEGAL GAS
VALVE
BURNER X
GVF-X If the controller detects that a gas valve has
activated at a time it should not this fault is
Generated.
-Ensure that the ignition module is not
miswired or that the module is not
faulty by swapping it with a known
good one. If the problem follows the
ignition module, replace the module
-Consult factory
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