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