Ignition Control Operation And Troubleshooting For Models Starting; Internal Control Failure; Troubleshooting - ALLIANCE CA050L Installation Operation & Maintenance

Operating Instructions
Ignition Control Operation and
Troubleshooting for Models Starting
3/11/13
WARNING
70458601 and 70458701 controls cannot be
serviced by the user. If any control failures
are detected, the controls must be replaced
by qualified service personnel. Risk of
explosion or fire can result if the control
module has been opened or with any
attempts to repair it and the warranty is
void.
Before troubleshooting the system, check the
following items:
- Verify all mechanical and electrical connections are
secure and tight.
- Verify all system wiring is correct.
- Verify there is a proper system ground. The igniter,
flame sensor and igniter module must share a common
ground with the burner. Nuisance shutdowns are often
caused by a poor or erratic ground.
- Verify that the system is powered and that the control
is calling for heat.
- If the control proceeds to an error code on the red
diagnostic LED, troubleshoot per the Fault conditions
table below:
Fault Conditions
LED Indication
Off Normal Operation
1 Flash At Power Up
2 Flashes Flame Without Call For Heat
3 Flashes Ignition Lockout
4 Flashes (70458701 Manual Reset Error
only)
Steady On

Internal Control Failure

NOTE: The LED will flash on for 1/4 second, then
off for 1/4 second during a fault condition. The
pause between fault codes is 3 seconds.
78
W818
Fault Mode
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Internal Control Failure
If the control detects an error in its software or
hardware, all outputs are turned off and the red LED
displays a steady ON condition. If this condition
persists after an attempt to restart, then the control
must be replaced.

Troubleshooting

Troubleshooting Guide
Symptom
Control in Lockout Manual reset of the control is
Mode (70458701 needed. Reset by pushing red
Control Only) lockout button or use front end
control.
Control does not 1. 24 VAC present between 24V
start, green LED is and ground on 70458701 only. If
off not, see machine schematic.
2. 24 VAC present between TH and
ground. If not, see machine
schematic.
Thermostat on, no 1. Cable connects to control and
spark or valve electrode. Voltage present at gas
valve.
2. Bad control. Check red LED for
steady on or flashing codes.
Valve on, no spark 1. Shorted electrode.
during TFI 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 1. Check electrode position and
TFI, no flame sense cleanliness.
after TFI 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.
Probable Cause
70457901ENR7