A G-TRAC MANUAL
IOM-24 Page 12 March 1999 R1
No Heat (Burner Not Firing)
G-TRAC DIAGNOSTIC LIGHTS
HEAT
CALL
PRE-
PURGE
TIMER
BURNER
ENABLED
COMBUS-
TION
BLOWER
OPERATING CONDITIONS OR PROBLEM
DIAGNOSIS
OFF
OFF OFF OFF
No heat call. Check if “HS” is powered.
Check discharge and/or reset sensors and
set points.
ON
OFF OFF OFF
Shorted combustion air switch or faulty
combustion fan motor.
ON
OFF OFF RUNNING
Is there power on terminal “AS”? If not, is air
switch open?
ON
ON OFF RUNNING
Unit running in pre-purge, which lasts 1 to 8
minutes. If pre-purge light stays on, G-TRAC
may be faulty.
ON
OFF ON RUNNING
Check for flame failure and/or power to flame
relay. G-TRAC thinks all is operating okay
and heat is on.
OFF
OFF OFF RUNNING
No heat call. G-TRAC has finished firing and
is in "maintain purge" mode for 1 to 15
minutes. If it stays like this, check sensors,
set points, resets, and calibration.
OFF
ON OFF RUNNING
There has been a short heat call. Check for
intermittent wiring, electrical noise,
intermittent sensors, set points, or rapidly
changing BMS Signals. ***
*** Shielded wire should be used on all sensors and remote thermostats.
Low Heat (Burner Firing)
G-TRAC DIAGNOSTIC LIGHTS
HEAT CALL
PRE-PURGE
TIMER
BURNER
ENABLED
COMBUS-
TION
BLOWER
OPERATING CONDITIONS OR
PROBLEM DIAGNOSIS
EITHER
OFF EITHER RUNNING
Check discharge and/or reset sensors
and set-point calibration.
ON
ON OFF RUNNING
Unit is on pre-purge.
If unit does not start
within 1 to 8 minutes, the G-TRAC may
be faulty.
ON
OFF ON RUNNING
Is unit over delivering supply air or is inlet
gas pressure low? ***
*** Inlet gas pressure should not fall to less than 6” on a 7” system or less than 13” on a 14” system when the unit is at
high fire.
NOTE: The following are some possibilities that are associated with lack of heat output
from G-TRAC’s.
Unit Short of Temperature Rise
If inlet gas pressure, manifold gas pressure and combustion are correct, note below, “Over Delivering Air”.
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