Troubleshooting - Honeywell TrolaTemp MABS EZ-2 Product Data

MASTERTROL® AUTOMATIC BALANCING SYSTEM™ (MABS®) EZ ZONE (EZ-2 AND EZ-4) CONTROL PANELS

TROUBLESHOOTING

The primary diagnostic tools are the system and damper status LEDs. See Table 9 for troubleshooting guide.
Symptom
No LEDs light
Erratic operation
Heat or Cool LEd flashes
continuously
Heat pump works in
Heat but not in Cool or in
Cool but not in Heat
Emergency heat not
coming on
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09 =
69-1360–2 G.H. Rev. 9-01
Table 9. Troubleshooting Guide.
Problem
No power to the panel.
Insufficient voltage.
Incorrect configuration
Panel in Emergency Heat mode
Panel needs resetting.
Heat LED flashing.
Cool LED flashing.
Incorrect thermostat.
Incorrectly wired.
Incorrectly wired.
Incorrect thermostat.
• Check for 24 Vac across TR2.
• Check circuit breaker; if hot, a short exists in
thermostat or damper wiring.
Check for 24 Vac ±10% across TR1 and TR2.
Verify jumpers and DIP switch setting for correct
configuration.
Check position of Em Heat switch.
Press Boot button and recheck system operation.
ZoneMAX Sensor tripped on high limit.
ZoneMAX Sensor tripped on high limit.
Install the correct thermostat.
If equipment is heat pump, be sure there is a Y1 or
W1 jumper installed.
Verify thermostat and equipment wiring.
Verify correct thermostat is used.
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Solution
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