Troubleshooting - York International ZQ Series Installation Manual

Troubleshooting

WARNING
Troubleshooting of components may require opening
the electrical control box with the power connected to
the unit. Use extreme care when working with
live circuits! Check the unit nameplate for the correct
line voltage and set the voltmeter to the correct range
before making any connections with line terminals.
When not necessary, shut off all electric power to
the unit prior to any of the following maintenance
procedures so as to prevent personal injury.
CAUTION
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation, which could cause injury to
person and/or damage unit components. Verify proper
operation after servicing.
WARNING
The furnace may shut down on a high temperature
condition during the procedure. If this occurs, the UCB
energize the supply air blower motor until the high
temperature limit has reset. Caution should be used
at all times as the supply air blower may energize
regardless of the room thermostat fan switch position.
Table 62: Flash Codes for the Gas Heat Ignition Control Board
Flash Code Description
Normal Operation - no status
Heartbeat or error information currently
needs to be displayed
a. No Power to the Control - Less
than 18 VAC is present at the
ignition control's R (P2-2 pin)
and C (P2-1 pin) connections
Steady Off b. The ignition control has
catastrophic damage that will
not allow the LED display (it is
likely that there will be visible
physical evidence of the damage)
The Ignition Control's
Steady On Microprocessor Has Not
Passed its Self-check
Technician Corrective Action
None.
Verify line voltage is present at the primary of the 75VA transformer,
verify 24 VAC is present at the secondary of the 75VA transformer.
Verify 24 VAC is present from the UCB's C to SD terminals indicating
the 3.2A control circuit breaker and phase monitor contacts are closed.
Verify 24 VAC is present at the ignition control's R (P2-2 pin) and C (P2-1
pin) connections indicating the unit to ignition control wiring is intact.
Cycle power to the control to eliminate the possibility that transient
voltage conditions such as surges, brownouts, etc. have not created
a false indication. If the steady on LED indication repeats, the control
will need to be replaced and potential causes for failure, such as
excessive voltage, RF interference, etc. should be investigated.
INSTALLATION MANUAL ZQ SERIES 3 - 5 ton 60 Hertz R-410A
Johnson Controls Ducted Systems
Table 61: Everyday Thermostat Controls fault
codes
SR. No. Condition
1 POWER FAILURE
2 CONTROL FAILURE
3 BLACKOUT CONDITION
4 BROWNOUT CONDITION
5 LIMIT SWITCH FAULT
6 DUAL HPS FAULTS
7 HPS1 FAULT
8 HPS2 FAULT
9 DUAL LPS FAULTS
10 LPS1 FAULT
11 LPS2 FAULT
12 DUAL FS FAULT
13 FS1 FAULT
14 FS2 FAULT
15 GV FALSE PROOF
16 GV LOST PROOF
2ND STAGE IN
17
ASCD (HEAT/COOL)
18 2ND STAGE ON (HEAT/COOL)
1ST STAGE IN ASCD
19
(HEAT/COOL)
20 1ST STAGE ON (HEAT/COOL)
21 FAN ONLY (NO HEAT/COOL)
22 NO ALARMS IN MEMORY
23 NORMAL IDLE
24 FACTORY TEST MODE
Ignition Control
Response to Flash Code
All functions available to
respond to heating demand.
The output relay contacts
open so inducer and gas valve
operation is not permitted.
The output relay contacts
open so inducer and gas valve
operation is not permitted.
Red LED Green LED
OFF OFF
ON OFF
7 PULSES OFF
6 PULSES OFF
8 PULSES OFF
3 PULSES 3 PULSES
OFF 3 PULSES
3 PULSES OFF
4 PULSES 4 PULSES
OFF 4 PULSES
4 PULSES OFF
5 PULSES 5 PULSES
OFF 5 PULSES
5 PULSES OFF
9 PULSES OFF
10 PULSES OFF
RAPID FLASH ON
ON ON
OFF RAPID FLASH
OFF ON
OFF FAST HEARTBEAT
2 PULSES 2 PULSES
OFF SLOW HEARTBEAT
RAPID FLASH RAPID FLASH
Method for Reset
None.
a. Restoration of
24 VAC power to
the ignition control.
b. None.
Cycling 24 VAC
power to the ignition
control or expiration
of the 60 minute
"watchdog" timer.
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