Troubleshooting - Honeywell TotalZone TZ-4 Product Data

TZ-4 TOTALZONE® ZONE CONTROL PANEL

TROUBLESHOOTING

Symptom
No LEDs are Illuminated
Damper LEDs on, but no
other LEDs illuminated.
Heat pump operates
incorrectly or not at all.
Erratic Operation
Heat LED flashing.
Cool LED flashing.
Purge LED flashes
continuously.
Add-A-Zone not operating.
68-0259-1
Table 8. Troubleshooting.
Possible Cause
No power to the board.
Transformers out of phase
Shorted wire.
Insufficient voltage.
Incorrect configuration.
Incorrectly wired.
Incorrectly configured.
Emergency Heat switch
on.
Zone-A-Lone Feature on.
High limit reached.
Low limit reached.
DATS or OT problem or not
connected.
Incorrectly configured.
Incorrectly wired.
18
Check for 24 Vac (±10%) across R and C.
If 48 Vac across R and T1, reverse T1 and T2 wires.
Check thermal circuit breaker. If hot, a short exists in
thermostat or damper wiring.
Check for 24 Vac (±10%) across R and C.
Check jumpers and DIP switches for correct configuration.
Verify equipment and thermostat terminal wiring.
Verify DIP switch configuration.
Verify position of O/B thermostat type jumper.
Turn off (down) Emergency Heat switch.
Turn off (up) Zone-A-Lone.
LED stops flashing with ten-degree fall and 2-1/2 minute
delay.
LED stops flashing with ten-degree rise and 2-1/2 minute
delay.
Verify that DATS and OT (if any) are connected and wired
correctly.
Verify DIP switch settings on the TAZ panels.
Check AZ1and AZ2 for correct wiring.
Verify that a separate transformer is used for each TAZ-4
panel.
Be sure that AZ1 and AZ2 are at least 12 in. from line voltage
wiring.
Action