Troubleshooting Guide
Control does not start, green LED is off
1. 24 VAC present between 24V and ground on 70458701 only.
If not, see machine schematic.
2. 24 VAC present between TH and ground. If not, see machine
schematic.
Thermostat on, no spark or valve
1. Cable connects to control and electrode. Voltage present at
gas valve.
2. Bad control. Check red LED for steady on or flashing codes.
Valve on, no spark during TFI
1. Shorted electrode.
2. Spark gap not correct. Set to .094-.156 inch.
3. High voltage cable is faulty or has a poor connection.
4. Control failure.
Spark on, no flame
1. Is gas on?
2. 24 VAC at gas valve.
3. Bad control. Check voltage between gas valve terminal MV
and GND on control.
Flame okay during TFI, no flame sense after TFI
1. Check electrode position and cleanliness.
2. Check high voltage wire.
3. Poor ground at burner.
4. Poor flame, check flame current.
Reset failure
1. Reset switch was pressed too long. Try to reset again.
2. Reset switch is shorted. Replace switch.
Proper Electrode Location
Proper location of the electrode assembly is important for optimal
system performance. The electrode assembly should be located
so that the tips are inside the flame envelope and about 1/2 inch
[1.2 cm] above the base of the flame. Refer to
Figure 61
.
TMB2317K_SVG
Figure 61
Flame Current Measurement
Flame current is the current that passes through the flame from
sensor to ground. To measure flame current, connect a True RMS
or analog DC micro-ammeter to the FC+ and the FC- terminals.
The reading should be 1.0 micro-amps DC or higher. If the meter
reads negative or below “0” on the scale, the meter leads are re-
versed. Re-connect leads with proper polarity.
Alternately, a Digital Voltmeter may be used to measure the DC
voltage between the FC+ and FC- terminals. Each micro-amp of
flame current produces 1.0 VDC, so a reading of 2.6 VDC would
equate to 2.6 micro-amps.
A good burner ground that matches the control ground is critical
for reliable flame sensing.
Ignition Control Operation for Non-CE
Models Through 3/10/13
Power Up
When power is applied to the ignition control, the control will be-
gin the ignition sequence within 1 – 3 seconds prepurge waiting
time.
Operating Instructions
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Copyright, Alliance Laundry Systems LLC -
DO NOT COPY or TRANSMIT
87
Part No. 70457901ENR12
Summary of Contents for YU050E
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