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Trouble shooting
2596151-C_EN_2010_Condair GS EGMS_IOM
7
Trouble shooting
The table below shows faults that may occur when operating the Condair GS with the optional exhaust
gas management system.
Fault/ Error message
Description of the fault
Troubleshooting
E138
Over Temperature Fault
The exhaust or tank safety sensor has
exceeded the safety limit. The unit will
not operate when this fault condition
is active.
• The unit may be operating with an
incorrect water level. This ssue may
also be associated with improper
operation of the float chamber or fill
valves.
• Exhaust vent may be blocked. En-
sure that the exhaust vent is free
of obstructions. Also verify that the
drain line from the exhaust is free
from obstructions.
• Thermocouple wires may be dam-
aged, or have kinks along their length.
• There may be excess scale buildup
on the coils of the primary heat ex-
changer.
• Temperature of the water supply may
be too high. The inlet water should
not exceed 25 °C. Optimum per-
formance obtained from inlet water
under 21 °C.
W149
AP Open
Air proving switch is open while the
humidifier is operating.
Should the air proving switch open during
operation, the controller will interrupt all
ignition modules and activate the blow-
ers at 100%. After a several seconds
(predetermined at factory), the controller
will attempt to restart humidification.
Three consecutive W149 warnings result
in a fault, E150.
• The air proving switch may be faulty
or has been disconnected.
• Check the wiring and tubing to the air
proving switches. Check for suction
in the pressure tubes. If the switch
does not close, it may be defective
and must be replaced.
• Check the wiring between the air
proving switches and connector J2
on the driver board. With the demand
off, and the blower not operating,
check for 24 VAC at pins 1 and 2 on
connector J2.
• There is a blockage at the inlet or
exhaust that is causing high pres-
sure in the system. This may cause
“dirty” combustion. Check for and
remove any blockages at the inlet
and exhaust.
E153
AP Exhaust Fault
One or more of the external safety
switches installed for the Exhaust in
Duct feature have opened.
• Check for the proper installation of
all safety switches, and verify that
they have been wired correctly to the
lowvoltage terminal.
• Ensure that the air handling unit/
system is operational.
