SERVICING
53
L
INE VOLTAGE NOW PRESENT
WARNING
These tests must be completed within a given time frame due
to the operation of the ignition control.
1. Check for 120 volts from Line 1 (Hot) to Line 2 (Neutral)
at the ignition control. No voltage, check the door switch
connections and wire harness for continuity.
2. Check for 24 volts from W to C terminal on the ignition
control. No voltage. Check transformer, room thermostat,
and wiring.
If you have 24 volts coming off the transformer but receive
approximately 13 volts on the terminal board between (C)
and (R), check for blown fuse.
3. Check for 120 volts to the induced draft blower by mea
-
suring voltage between Pin 1 (on the 2-pin connector) and
Line (Neutral) on the control board. No voltage, replace
ignition control.
4. If voltage is present in Steps 1 through 3 and the induced
draft blower is operating, check for 120 volts to the ignitor
during the preheat cycle. Measure voltage between Pin 2
(on the 2-pin connector) and Line (Neutral) on the control
board. No voltage, check pressure switch.
5. After the ignitor warm-up time, begin checking for 24 volts
to the gas valve. Voltage will be present for seven seconds
only if proof of flame has been established.
S-314 CHECKING FLAME SENSOR
A flame sensing device is used in conjunction with the ignition
control module to prove combustion. If proof of flame is not
present the control will de-energize the gas valve and "retry"
for ignition or lockout.
WARNING
HIGH
VOLTAGE
D
ISCONNECT
ALL
POWER BEFORE SERVICING OR
INSTALLING THIS UNIT.
M
ULTIPLE POWER SOURCES MAY
BE PRESENT.
F
AILURE TO DO SO MAY CAUSE PROPERTY
DAMAGE, PERSONAL INJURY OR DEATH.
1. Connect a micro-amp meter in series with this wire and
the sensor terminal.
2. Be sure the positive side of the meter is to the sensor
(depending on the model) and the negative side of the
meter is to sensor terminal.
L
INE VOLTAGE NOW PRESENT
WARNING
3. Place the unit into a heating cycle.
4. As soon as flame is established a micro-amp reading
should be evident once proof of flame (micro-amp reading)
is established, the hot surface ignitor will be de-energized.
5. The Integrated Ignition controls will have 1 to 4 micro-
amps. If the micro-amp reading is less than the minimum
specified, check for high resistance wiring connections,
sensor to burner gap, dirty flame sensor, or poor grounding.
6. If absolutely no reading, check for continuity on all
components and if good - replace ignition control module.
NOTE:
Contaminated fuel or combustion air can create a
nearly invisible coating on the flame sensor. This coating
works as an insulator causing a loss in the flame sense sig
-
nal. If this situation occurs the flame sensor must be cleaned
with steel wool.
ERROR CODE
Red LED Flash
Error / Condition
Flash Codes stored in memory (auto-erased after 14 days)
1
System Lockout (Retries Exceeded)
2
Pressure Switch stuck Closed
3
Pressure Switch stuck Open
4
Open High Temperature Limit Switch
5
Flame Sensed>4.25 Seconds with Gas Valve De-Energized
6
Open High Temperature Limit Switch
8
Igniter Relay Fault
10
Open Fuse
11
Igniter Open
12
Inducer Relay Error
Flash Codes NOT stored in memory
7
Low Flame Sense Signal
9
Twinning Fault
OFF
Control Failure / No Power / Internal Fault / IRQ Loss. Gas Heat-
ing Lockout (Gas valve energized when it should be
de-energized) Or Gas Valve De-energized when it should
be Energized
Rapid Flash Reverse Polarity
Continuous On Normal Operation
