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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 78: Everyday Thermostat Controls fault
codes
SR. No.
Condition
Red LED
Green LED
1
POWER FAILURE
OFF
OFF
2
CONTROL FAILURE
ON
OFF
3
BLACKOUT CONDITION
7 PULSES
OFF
4
BROWNOUT CONDITION
6 PULSES
OFF
5
LIMIT SWITCH FAULT
8 PULSES
OFF
6
DUAL HPS FAULTS
3 PULSES
3 PULSES
7
HPS1 FAULT
OFF
3 PULSES
8
HPS2 FAULT
3 PULSES
OFF
9
DUAL LPS FAULTS
4 PULSES
4 PULSES
10
LPS1 FAULT
OFF
4 PULSES
11
LPS2 FAULT
4 PULSES
OFF
12
DUAL FS FAULT
5 PULSES
5 PULSES
13
FS1 FAULT
OFF
5 PULSES
14
FS2 FAULT
5 PULSES
OFF
15
GV FALSE PROOF
9 PULSES
OFF
16
GV LOST PROOF
10 PULSES
OFF
17
2ND STAGE IN
ASCD (HEAT/COOL)
RAPID FLASH
ON
18
2ND STAGE ON (HEAT/COOL)
ON
ON
19
1ST STAGE IN ASCD
(HEAT/COOL)
OFF
RAPID FLASH
20
1ST STAGE ON (HEAT/COOL)
OFF
ON
21
FAN ONLY (NO HEAT/COOL)
OFF
FAST HEARTBEAT
22
NO ALARMS IN MEMORY
2 PULSES
2 PULSES
23
NORMAL IDLE
OFF
SLOW HEARTBEAT
24
FACTORY TEST MODE
RAPID FLASH
RAPID FLASH
INSTALLATION MANUAL ZY SERIES 3 - 10 ton 60 Hertz R-410A
129
Johnson Controls Ducted Systems
Summary of Contents for ZY Series
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