General Troubleshooting - Reznor UDAP Installation & Operation Manual

10.3 Troubleshooting (cont'd)
IMPORTANT: When using
a multimeter to troubleshoot
the 24 volt circuit, place the
meter's test leads into the 5
or 9 pin connectors located
on the ignition control. Do
not remove connectors or
terminals from the electri-
cal components. Doing so
can result in misinterpreted
readings due to the ignition
control board's fault mode
monitoring circuits.
DSI Integrated Control Module (Circuit
Board) Trial Troubleshooting Flowchart
Is there minimum
YES
flame current at the
flame sensor?
Is there
minimum flame current YES Replace control
at the control
module?
NO
Check connections to flame
sensor and/or moisture in the
burner assembly.

General Troubleshooting

PROBLEM PROBABLE CAUSE
Venter motor will not 1. No power to unit.
start
. No 24 volt power to integrated circuit board.
3. Integrated circuit board fuse blown.
4. No power to venter motor.
5. Integrated circuit board defective.
6. Defective venter motor.
Burner will not light 1. Manual valve not open.
. Air in the gas line.
3. Gas pressure too high or too low.
4. No Spark:
a) Loose wire connections.
b) Transformer failure.
Form I-UDA, P/N 195673 Rev 13, Page 36
Control Status - Green LED Codes
Steady ON Normal Operation, No call for heat
Fast Flash . Normal Operation, Call for heat
1 Flash ...... System Lockout, Failed to detect or sustain flame
2 Flashes .. Pressure Switch Did Not Close within 30 Seconds of Venter Motor
3 Flashes .. High Limit or Flame Rollout Switch Open
4 Flashes ....Pressure Switch is Closed Before Venter Motor is Energized
Steady OFF Blown fuse, No Power, or Defective Board
Flame Status - Yellow LED Codes
Steady ON ..Flame is sensed
Slow Flash ..Weak flame (current below 1.0 microamps ± 50%)
Fast Flash ...Undesired Flame (valve open and no call for heat)
YES
Does gas
ignite?
Is the flame
NO
sensor corroded?
NO
Is the sensor
located in flame
module.
correctly?
NO
Reposition
flame sensor.
Check gas pressure YES
and supply voltage.
If either are low,
correct and repeat
startup.
Trial for Ignition
Call for Heat
Is there a
YES
spark across gap at
ignitor?
NO
YES Clean flame
sensor.
YES
Replace flame
sesnsor.
YES
Is gas
flowing?
Is the ignitor
Replace gas
position correct in the
valve.
gas flow?
NO
Check wiring and
Reposition
connections to
spark ignitor.
gas valve.
REMEDY
1. Turn on power, check supply fuses or circuit breaker.
. Turn up thermostat; check control transformer output.
3. Correct cause. Replace fuse (type ATC or ATO, 32VDC, 3A).
4. Tighten connections at circuit board and/or motor terminals.
5. Replace integrated circuit board.
6. Replace venter motor. See Paragraph 29.
1. Open manual valve.
. Bleed gas line (initial startup only).
3. Supply pressure should be 5" - 14" w.c. for natural gas or 11" - 14" w.c.
for propane gas.
4.
a) Be certain all wire connections are solid.
b) Be sure 24 volts is available.
NO
Is there Check high
YES
spark voltage at voltage wire
control? continuity.
NO
Replace
Is there 24V P1-2 YES
control
to power control?
module.
NO
Check wiring
and/or 24VAC
transformer output.
NO
Is there
YES
24VAC at the gas
valve?
NO
Is there 24VAC
YES
from gas valve output on
control module to
chassis?
Replace
NO
ignition
control
module.