TROUBLESHOOTING
Page 57
HARMONY IIIT ZONE CONTROL SYSTEM
Code
#
Fail-safe
(System
Shut Down)Remedy
Fault
Indicated
(0−off;1−on)
Diag LED
1234
3 1100 Unsteady
thermostat
input
This error occurs when a thermostat changes state repeatedly and rapidly,
indicating that the thermostat is making intermittent contact and needs atten-
tion. The offending thermostat will be ignored for 4 minutes after the zone
control system detects the problem. After 4 minutes if the signal from the
thermostat is steady again, it will be recognized by the zone control system.
Disconnect thermostats until error goes away. This will identify the source of
bad input. If error remains after all inputs have been disconnected, replace
zone control panel.
No
4 0010 Defrost while
gas heat
selected
System detected defrost signal at W1−Def terminal block while the jumper is
selected for the furnace. May be caused by:
S Wrong selection for INDOOR UNIT jumper.
S OUTDOOR UNIT terminal block misfired.
S Zone control system failure.
Check unit installation instructions for correct wiring. If no signal is present at
W1, then replace zone control panel.
Yes
5 1010 Discharge Air
Sensor (DAS)
detects high
heating
temperature
This condition may occur any time the discharge probe senses air warmer
than 160_F for furnace or 135_F for heat pump. If system is in zone mode
when this code is set, the system continues in zone mode, shuts off equip-
ment, and runs continuous blower to satisfy demand. The heat pump or fur-
nace will remain off for a minimum of 5 minutes and until the DAS senses
130_F.
Add more air to zone or redistribute zones to divide air more evenly.
No
6 0110 Zone air
jumper not
selected
1) Air selected for fewer than two zones or, 2) No air is selected for zone 1
or, 3) If a zone air selection jumper is left off of a zone that issues a heat or
cool demand. In this case the system will assume that a PIAB of 100 is re-
quired to service the zone.
Make a zone air jumper selection. If jumpers are in place, replace the zone
control panel.
No
7 1110 Open or
shorted DAS
If system is operating, system will be forced into central mode. The compres-
sor will cycle from high to off in cooling. The compressor will cycle from high
to off in heating. The furnace will operate normally in gas heat.
Replace discharge probe. If error persists, replace zone control panel.
No
8 0001 Simultaneous
heat and cool
call from same
thermostat
(Or inconsistent thermostat signals) Make sure the thermostats are correctly
connected to the zone control panel. If error persists after you check the
thermostats and jumper selections, try another thermostat model or brand.
Demand will be ignored from the zone sending bad signals. See Table 9.
No
9 1001 Open pressure
switch (heat
pump
systems only)
Displayed when the pressure switch opens and does not necessarily mean
there is anything wrong. However, try increasing the air delivered to the
smallest zone. An open pressure switch will stage the heat pump down to 1st
stage only, if after 90 seconds the switch does not close, the heat pump is
shut off and backup heat is used to satisfy the call. Green Pressure switch
LED on zone panel will be off.
No
10 0101 Insufficient
heating
Occurs when there is a call for heating and the Discharge Air Sensor does
not sense a increase in supply air temperature indicating the heating is not
functioning properly.
No
11 1101 DAS sensed
frozen coil
Indicates discharge air temperature sensed by discharge air sensor drops
below 45 degrees during the cooling mode. When sensed, the condensing
unit will stop and as long as the cooling demand is present the ID blower will
continue to run until the 5 minute timed off timer expires and the discharge
air sensor senses 55_F.
No
12 0011 Multiple jumper
selection
Each jumper block on zone control panel is allowed only one jumper, except
for the system setup block. Remove extra jumper.
No
13 0111 Dual−fuel
furnace use
lock−in
Heat pump was not able to maintain desired discharge air temperature; fur-
nace will be used to satisfy heat calls for the next 3 hours. After 3 hours, the
heat pump will be used again.
No
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