Dps 016-028 Gas Furnace Ignition Troubleshooting - Daikin DPS005 Installation And Maintenance Manual

DPS 016–028 Gas Furnace Ignition Troubleshooting
Table 26: 300/450/600 MBH Staged Ignition Control Troubleshooting Guide (UTEC 1016 Ignition Board)
LED Indicator System Status
Steady ON System Normal
LED OFF Lockout
1 Flashes Lockout
2 Flashes Lockout
3 Flashes Lockout
4 Flashes Lockout
5 Flashes Lockout
Table 27: Modulating Control LED Status Indicator
LED Indicator PCB Label
Main Power PWR
AFS AFS
Start Up SU
Modulation MOD
Relay 1
R1
(energized)
Relay 2
R2
(energized)
Relay 3
R2
(energized)
IM 1125-7 • REBEL ROOFTOPS
Fault Description
N/A
LED is OFF
Combustion air pressure switch contact
is open with inducer fan running.
Combustion air pressure switch contact
is closed when inducer fan is not
running.
Ignition locked out from too many
ignition attempts
Ignition lockout from too many flame
losses within a single heat.
Control hardware fault detected
Color Functionality Description
Blue Light ON: Controller has received a call for heat and is powered.
Green Light ON: Combustion Inducer Blower is running
Light ON: Controller has received signal that ignition has commenced and gas modulating valve has moved to 66% open
Yellow
position. Valve will be held at this position for 30 seconds to insure burner ignition is stable.
Green Modulating section is operational and modulating
Relay 1 is energized and combustion inducer blower is operating at low speed.
Red
NOTE: When Relay 1 is not energized combustion inducer fan has permissive to operate at high speed.
Relay 2 is energized and Non-modulating (Staged) gas train is operational. 1st coil of two stage gas safety valve is
energized.
Red
NOTE: When R2 LED is on the two stage gas safety valve is at low fire.
Relay 3 is energized and Non-modulating (Staged) gas train is operational. 2nd coil of two stage gas safety valve is
energized.
Red
NOTE: When both R2 & R3 LED are on the two stage gas safety valve is at high fire.
Possible Causes and Corrective Action
N/A
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. 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.
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.
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 flame sensor wiring. Check to see if flame sensor is grounded.
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.
1. Change ignition board.
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