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b) Start the dryer ... with the burner on, the correct water column (W.C.) reading in
inches should be:
When a gas dryer is first started (during initial time of installation/start-up), it has
a tendency not to ignite on the first ignition attempt. This is due to the fact that the
gas supply piping is filled with air, so it may take a few minutes for the air to be
purged from the supply lines. During this purge period, there may be insufficient
gas pressure for ignition, which might cause the HSI module to go into the LOCK-
OUT MODE (the L.E.D. will LIGHT RED CONTINUOUSLY).
NOTE: During the purge period, check to be sure that ALL gas shut-off valves are open.
NOTE: To reset the HSI MODULE if it is in the LOCKOUT MODE, open and close the
main door then restart the dryer.
2) Flame Sensor
a) Flame Sensor Fault Code
The HSI Module is equipped with a diagnostic circuit that detects a fault in the
Flame Sensor Probe or any related circuits in the internal circuits in the HSI module.
When a fault is detected, the red L.E.D. (light emitting diode) indicator light will
flash 2 blinks. To clear this code either discontinue power to the dryer/HSI Module
or replace the FLAME PROBE or HSI MODULE.
Natural Gas ........................................ 3.5 - 4 inches W.C.
L.P. (liquid propane) Gas .................. 10.5 - 11 inches W.C.
FLAME SENSOR CURRENT CHECK
b) Flame Sensor Current Check
Flame current is the current which
passes through the flame from the
Flame Sensor to ground (GND). The
minimum flame current necessary to
keep the HSI system from LOCK-
OUT is .7 microamps. To measure
flame current, connect an analog
D.C. (direct current) microammeter
to the FC1/FC2 terminals (refer to the
adjoining illustration).
The meter should read .7 microamps
or higher. If the meter reads below
0 on the scale, then the meter
leads are reversed. Disconnect
power and reconnect the meter leads
for proper polarity.