Nortec GS Series - Manual (Page 82)

79 | GS Series Installation
Table 13: GSP Warning List
GSP Warning
Displayed Description of Warning Troubleshooting
IMW-X Once the controller activates an ignition module, it will allow 4 minutes
for the gas valve to activate. After the trial period, if the gas valve has
not activated, a fault will be generated. The module will be locked out
and the next burner will be indexed.
SEE FAULT LIST
APW-X Should the air proving switch open while the unit is operating this
warning is generated. The controller shuts down and retries. There are
no limits to the amount of times this warning is generated.
SEE FAULT LIST
AOW-X On startup if the AP switch does not close within the proving period.
After 3 tries, a fault will be generated.
SEE FAULT LIST
BHW-X If a blower RPM is above the RPM tolerance limit this warning is
generated. If it is above the RPM tolerance limit for more than 10
seconds a fault will be generated.
SEE FAULT LIST
BLW-X If a blower RPM is below the RPM tolerance limit this warning is
generated. If it is below the RPM tolerance limit for more than 10
seconds a fault will be generated.
SEE FAULT LIST
HMW In the user menu the user sets the maintenance time. Once this time
expires this warning is displayed. The maintenance time is measured
in weighted operational hours.
With switch 5, #4 activated, this warning will remain until the warning
is reset in the user level.
SEE FAULT LIST
UNW-6 Low water level has not been reached within expected time interval
during initial fill sequence. Unit will continue filling while warning is
displayed. A Water Fill Fail fault will be generated if the low water level
is not reached after an additional length of time.
SEE FAULT LIST
UNW-C Keep warm feature has initiated combustion sequence at 75% output.
This occurs when keep warm feature has been activated via dip-switch
settings, the system demand is below minimum and the tank
temperature sensor is registering cold (open contacts). ( 1) Warning message
will stop being
displayed once
tank temperature
sensor indicates
water is warm.
(2) Keep warm
feature can be
disabled using
dip-switch
settings.