Measure voltage at pins 1 and 2 on DIM 2-pin connector.
The voltage should nominally be:
15 to 40 VDC when powered from a TSI electric
actuators.
24 to 30 VAC when powered from a transformer.
If correct voltage is measured, internal DIM fuse is probably
blown. Unplug 2-pin connector from DIM for 2 minutes. The
internal fuse will automatically reset. Plug unit back in and
check display. If display is still blank, check all wiring, etc.
If approximately 5 volts is measured, the fuse in the electric
actuator is blown. Disconnect power to the electric actuator
for two minutes to reset fuse. Disconnecting power requires
either shutting off circuit breaker or disconnecting the wires
on pins 1 and 2 on the electric actuator.
If zero volts are measured, see No power to DIM.
Verify circuit breaker is on.
Verify transformer primary measures 110 VAC.
Verify transformer secondary measures 24 to 30 VAC.
If using DC power output from TSI electric actuator:
Verify electric actuator is receiving 24 to 30 VAC between
pins 1 and 2.
Verify 15 to 40 VDC is found between pins 3 and 4 of the
electric actuator.
Verify circuit breaker is on.
Verify transformer primary measures 110 VAC.
Verify transformer secondary measures 24 to 30 VAC.
Verify 15 to 40 VDC is found between pins 3 and 4 of the
electric actuator (if powered from a TSI electric actuator)
Verify DIM voltage on pins 1 and 2 is 24 to 30 VAC (if
powered from a transformer), or 15 to 40 VDC (if powered
from a TSI electric actuator).
If proper voltage is found between pins 1 and 2 of the DIM,
all wiring has been checked, fuses have been reset, and
screen is still blank, the DIM is probably defective. Replace
DIM.