Daikin MPS015 F - Ignition Control Module for Staged Gas Furnace; Ignition Control Module LED Diagnostics

Ignition Control Module for Staged Gas Furnace
Figure 28: Typical Staged Gas Furnace Electrical Schematic with Sensor
Ignition Control Module LED Diagnostics
The LED indicators (Table 19) can be used to diagnose faults associated with the staged gas furnace.
Table 19: Staged Ignition Control Troubleshooting Guide (UTEC 1016 Ignition Board)
LED Indicator System Status Fault Description Possible Causes and Corrective Action
Steady ON System Normal N/A Power applied, control OK
LED OFF Lockout LED is OFF
No power or control hardware fault
1. Check 120V is being supplied to heater transformer.
2. Check that 24 VAC is being supplied by transformer. Replace transformer if not
being supplied 24 VAC.
1 Flashes Lockout
Combustion air pressure switch contact
is open with inducer fan running.
Combustion fan motor energized, pressure switch open
1. Check air pressure switch hose and hose connection between switch and fan.
2. Check reset switch is not tripped for rollout switch(s).
3. Check high limit switch is not open.
4. Replace pressure switch if contact does not close when fan is running.
2 Flashes Lockout
Combustion air pressure switch contact
is closed when inducer fan is not
running.
Combustion fan motor OFF, pressure switch closed
1. Check wiring between PS1 and PS2 on ignition control board for correct
connection and proper wiring.
2. Check pressure switch functions correctly with and without pressure.
3. Replace pressure switch if fails to function correctly.
3 Flashes Lockout
Ignition locked out from too many
ignition attempts
Ignition lockout from too many trials
1. Verify gas supply is present.
2. Verify gas safety valve is working correctly.
3. Verify gas manifold pressure is adequate and correct.
4. Check spark igniter is not cracked or dirty. Check spark igniter wire is not
covered with oil and debris or cracked. Check wire is connected correctly.
5. Check ame sensor wiring. Check to see if ame sensor is grounded.
4 Flashes Lockout
Ignition lockout from too many ame
losses within a single heat.
Ignition lockout from too many ame losses within single call for heat
1. Check pressure switch hose for leaks or poor connection
2. Check for condensate in pressure switch hose.
3. Check pressure tap on combustion blower and combustion pressure switch for
blockage.
4. Check functionality of combustion inducer fan.
5 Flashes Lockout Control hardware fault detected
Control hardware fault detected
1. Change ignition board.
Ignition Module (IM)
IND
COM
C
Gas Valve
C
HI
LO
MV
Roll-Out Switch #2
(ROS2)
Air Pressure Switch
(APS)
PS2
PS1
W
R
FS
White
Flame Sensor
HV
Spark Ignitor
orange
black white
tan
yellow
yellow2
1
R
Roll-Out Switch #1
(ROS1)
Green
green
tan
orange
X
24VAC
115VAC
violet
green
black white
L2
G
N
D
red
white
gre
en
TB_L1
TB_L2
T
B
_
G
1
TB_2G
T3
Class II
40VA
L1
L1
Inducer Fan
Motor
C
1/4" Quick Connect Terminal
Terminal Block
APS Airflow Proving Switch
ROS1 Roll Out Switch #1
ROS2 Roll Out Switch #2
IM 1058-8 • MAVERICK II ROOFTOP SYSTEMS 34 www.DaikinApplied.com
oPTIonal Gas heaT