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Troubleshooting
If the current flowing into the Zebrastat
through these two wires should exceed 3
Amps, the breaker will 'trip', and the lower Trip
LED will light. The breaker will stay in this
'tripped' condition until the power is removed
from one of the leads for about 15 seconds.
(Some electronic thermostats may start a set/
reset cycle as they lose power and drop out.)
A typical problem causing a fuse to blow on
one of these boards is a shorted thermostat
wire. Diagnosing which wire is accomplished
much easier with a ZebraStat: Hook up the
ZebraStat as described above. When the
Zebrastat's breaker trips, remove power to
the system for 15 seconds. While the power
is off remove one thermostat wire at a time
from the control board, turning on the power
again after each disconnection. When the Trip
LED does NOT light up after removing a wire,
the suspect circuit has been found. If all ex-
ternal low voltage control wires are removed,
and the Trip LED still lights, it's time to suspect
that the board itself may have a problem.
(continued)
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