Johnson Controls ZY Series User 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 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

Johnson Controls ZY Series Specifications

General

Brand	Johnson Controls
Model	ZY Series
Category	Air Conditioner
Language	English