York International ZQ Series Installation Manual page 83

Table 62: Flash Codes for the Gas Heat Ignition Control Board
Flash Code Description
Open Rollout - 24 VAC has
7 Flashes been lost to the control's
rollout switch input (P1-6 pin)
The Gas Valve Failed To Shut Off -
flame has been sensed for longer
8 Flashes
than 2 seconds when the first
stage gas valve output is off
Indoor Airflow Failure Open Limit
- 24 VAC has been lost to the
control's limit switch input (P1-9
9 Flashes
pin) for a duration of more than
6 minutes with 24 VAC present at
the control's W1 input (P2-3 pin)
a. Gas Valve Miss-wire - 24 VAC has
been present for longer than 1
second at the first stage and/or
second stage gas valve output
(P1-7 pin and/or P1-4 pin) when
the gas valve is commanded
off by the ignition control
10 Flashes
b. Ignition Control Gas Valve Relay
Contact Failed to Close - 24 VAC
has not been sensed for longer
than 1 second at the first stage
and/or second stage gas valve
output (P1-7 pin and/or P1-4 pin)
when the gas valve is commanded
on by the ignition control
Technician Corrective Action
Verify that combustion air openings are without blockages and
that the unit has proper clearance to the structure and adjacent
units. Verify that the burners are clean and without blockages that
could interfere with gas flow. Verify that the ignitor sparks with
an ≈1/8" gap to the crossover area of the left burner. Verify that
the gas lines provide proper gas inlet pressure. Verify that the gas
valve is adjusted to provide proper manifold pressure. Verify that
there is no wind, rain or snow entering the heat compartment
to interfere with ignition or the burners. Verify that there are no
conditioned air leaks or heat exchanger breaches to interfere with
ignition or the burners. Verify wiring for the rollout switch is intact.
Verify that the gas valve is not slow to shut off, leaks by
or otherwise does not completely shut off gas flow when
de-energized. Verify the gas valve wiring to is intact and
not shorted in a manner that would improperly allow 24
VAC from another circuit to be applied to the gas valve.
Correct the no/extremely low indoor airflow condition. Verify filters,
indoor coil and blower wheel are clean. Verify that the blower belt is
intact, properly maintained and adjusted; the blower motor fuses are
intact, contactor and motor are operable and wheel has the correct
rotation. Verify that the ducting is without blockages. Verify indoor
air volume is at least the minimum required for the heat section
by using the Airflow Mesurement Charts in the Technical Training
Manual or other method such as temperature rise, balometer, etc.
Verify wiring for main and auxiliary limit switches is intact. Verify
main and auxiliary limit switches are not failed in an open position.
Verify gas valve wiring from the ignition control to the gas valve is
intact and not shorted in a manner that would improperly allow 24
VAC from another circuit to be applied to the control's P1-7 and/
or P1-4 gas valve output pins. Verify the control's gas valve output
relay contacts for first stage (P1-8 to P1-7) and second stage (P1-7
to P1-4) are not shorted or fail to close when commanded on.
INSTALLATION MANUAL ZQ SERIES 3 - 5 ton 60 Hertz R-410A
Johnson Controls Ducted Systems
Ignition Control
Method for Reset
Response to Flash Code
Closure of the rollout
The gas valve output relay contact
switch (24 VAC input
opens so gas valve operation is not
to P1-6 pin) then
permitted, following a 5 second
cycling first stage
inducer post purge the induced
heat input or cycling
draft output relay contact opens so
24 VAC power to
inducer operation is not permitted.
the ignition control.
The gas valve output relay contact
opens so gas valve operation is not
permitted, the induced draft output
ignition control.
relay closes to operate the inducer.
The gas valve output relay contact
opens so gas valve operation
is not permitted, the induced
draft output relay contact ignition control.
closes to operate the inducer.
Initally, the output relay contacts
open. Then, if 24 VAC remains
present at the P1-7 pin after
15 seconds, the induced
ignition control.
draft output relay contact
closes to operate the inducer.
Cycling 24 VAC
power to the
Cycling 24 VAC
power to the
Cycling 24 VAC
power to the
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