Troubleshooting Charts - Daikin DP14UM Service Instructions Manual

TROUBLESHOOTING CHARTS

LED
DESCRIPTION
ACTIVITY
NO 24 VAC POWER
LED OFF
TO CONTROL
RED,
POWER-UP
AMBER,
VERIFICATION OF LED
GREEN
CONTROL FAULT
STEADY ON
DETECTED
1 FLASH RETRIES EXCEEDED
PRESSURE SENSOR
2 FLASHES
NULL ERROR
PRESSURE SENSOR
3 FLASHES
SPAN ERROR
HIGH LIMIT
4 FLASHES
SWITCH OPEN
FLAME PRESENT
5 FLASHES
WITH GAS VALVE OFF
NORMALLY CLOSED
BLOCKED BURNER
6 FLASHES
SWITCH / AUXILIARY
SWITCH OPEN
GAS VALVE CIRCUIT
7 FLASHES
SHORTED
8 FLASHES RESERVED
HIGH LIMIT SWITCH
10 FLASHES RECOVERY TIMER
EXPIRED
34
PCBBL216 ULN CONTROL ERROR CODES
MINIMUM
COLOR
LOCKOUT PERIOD
•
or 24 volt power to control
N/A N/A
module.
N/A N/A
• Relay failure, memory
failure or hardware failure
1 HOUR OR
RED
HARD LOCKOUT
• Lockout due to 3 ignition
attempt retries.
1 HOUR FIXED
RED
• With inducer off (no call
for heat), pressure sensor
gets feedback from
5 MINUTES
RED
inducer when it should be
zero.
• Inducer not maintaining
pressure setting.
5 MINUTES
RED
• Primary limit or auxiliary
MAXIMUM
limit circuit is open.
RECOVERY TIME
RED
1 HOUR AFTER MAX
TRIPS EXCEEDED
• Faulty control module.
5 MINUTES
RED
MAXIMUM
• Burner temperature limit
RECOVERY TIME
switch open.
RED
1 HOUR IF TIME
EXCEEDED
• Bad wiring.
1 HOUR • Faulty control module.
RED
N/A
RED
• Primary or burner limit
did not reset within
1 HOUR OR specified time period.
RED
HARD LOCKOUT
POSSIBLE CAUSES
No 240 volt power to unit • Confirm 240- and 24-volt power to integrated
control board.
• Check for possible shorts in 240- and 24-volt
circuits. Repair as necessary.
• Inspect wiring connections from control board to
all key component for damage or mis-wiring.
• Check gas valve, induced draft motor,
transformer and other components for damaged,
defective or grounded component.
• Replace bad integrated control module.
• Check inlet and outlet gas pressure at gas valve.
• Check flame sensor signal. Clean sensor if
coated and/or oxidized.
• Check unit ground wiring.
• Check inducer to confirm it is not operating.
• Check inducer and pressure sensor for loose
hose.
• Check pressure sensor wiring and correct wiring
as needed.
• Replace pressure sensor if faulty.
• Check pressure sensor hose for blocked or
pinched hose or improper connection.
• Check wiring connections.
• Replace pressure sensor if faulty.
• Check circulator blower speed and performance.
• Check filters and ductwork for any restrictions.
• Check external static pressure for undersized
duct system.
• Check primary limit.
• Check wiring connections.
• Replace bad integrated control module.
• Excessive flame - check inlet and outlet gas
pressure at gas valve.
• Check induced draft blower for proper
performance.
• Check wiring connections.
• Inspect wiring for damage or mis-wiring.
• Repair/replace as needed.
• Replace bad integrated control module.
• Check gas valve outlet pressure for over-firing.
• Check blower fan speed for correct speed
setting.
• Check filters and ductwork for any restrictions.
• Check external static pressure for undersized
duct system.
CORRECTIVE ACTIONS