Daikin DPS028 - Page 55

Table 24: Functional Alerts — DPS 003–015 only
Display Information Alert Description Possible Cause Solution
AO1
Failed ignition attempt
Maximum number of
allowed retries not met
The ame could not be
established during the
trial for ignition period.
This alert indicates the
maximum number of
retries has not been
exceeded and furnace
operation will continue with
another ignition attempt.
See “01” in the
LOCKOUT ERRORS
section.
See “01” in the
LOCKOUT ERRORS
section.
AO2
Lost Flame
The ame sensor signal
has been lost after ame
is established during a
call for heating. This alert
is displayed during the
ignition RECYCLE period
prior to the next ignition
attempt.
A. Flame sensor coated 1. Clean ame rod sensor.
B. Flame sensor
improperly mounted or
grounded
1. Check ame sensor
wiring integrity and
ceramic for cracks.
2. Re-install / replace
ame sensor.
C. Unstable ame pattern
1. Check that all burner
assembly components
are properly installed.
2. Check that all seals
between the vestibule
area and the heat
exchanger area are
tight.
3. Insure that the
combustion door
gasket is in place and
the door is properly
installed.
D. Insufcient intermediate
gas manifold pressure
through main gas
safety valve
1. Check for faulty gas
valve wiring.
2. Check 24 VAC to gas
valve assembly.
3. Check inlet pressure to
safety gas valve.
4. Check outlet pressure
from the safety gas
valve.
5. Replace safety gas
valve if faulty.
E. Insufcient gas manifold
pressure to burner
through modulating ball
valve assembly
1. Check voltage to gas
valve actuator. (2 – 10
VDC depending on
model)
2. Check alignment and
set screw connection
between ball valve and
actuator.
AO3
Insufcient Combustion Air
Furnace Functional
Furnace cannot achieve
desired combustion air
ow due to blockage or
high altitude operation
resulting in a de-rate of the
furnace.
A. High altitude operation
1. Normal operation.
Furnace automatically
de-rates for high
altitude conditions
B. Partially blocked vent
1. Check air inlet and
outlet for blockage.
2. Check venting
conguration for
excessive venting
length, improper sizing,
etc..
C. Leak in sensing hose
1. Check sensing hose for
cracks, crimps or loose
connections.
D. Low Line Voltage
1. Check sensing hose for
cracks, crimps or loose
connections.
E. Faulty inducer assembly
1. Insure correct inducer
assembly installed and
functioning properly.
opTIonal gas heaT
www.DaikinApplied.com 55 IM 1125-7 • REBEL ROOFTOPS