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(3) Run all applicable tests before assuming Module or Compressor to be faulty.
B: Compressor Not Running, No Start Attempt.
Probable cause Action
1 Supply voltage too low Check voltage with a digital multi-meter
at the terminals on the Module. This
must be 11.7v or more for a 12v supply
& 24v or more for a 24v supply. Inspect
power supply, ground connections &
components for integrity. Check wire
sizing. Charge batteries if necessary.
2 Supply voltage too high If a 12v supply is faulty & delivers over
17v, the compressor will not run. If it is
over 24v, it will assume that it is a 24v
supply & act accordingly.
3 Polarity incorrect Check that the polarity is correct at the
Module.
4 Faulty thermostat Remove the thermostat wires & jumper
the terminals that they were on together
temporarily. If the system then runs,
make the connection permanent &
control the system manually from the
breaker on your supply panel. Replace
thermostat as soon as possible.
5 Thermostat wired
incorrectly, or faulty
connections.
Refer to the installation instructions &
confirm that connections are as they
should be. Ensure that the thermostat
connectors are pushed firmly on to the
Module terminals.
6 Multi-speed board
incorrectly installed (if
fitted)
Check to make sure that the 2
connectors at the rear of the multi-speed
board are attached to the C & T
terminals of the Module.
7 Multi-speed board faulty
(if fitted)
** Optional Part **
Remove board & jumper terminals C &
T on the Module. Note; If the thermostat
wires are connected directly to C & T on
the Module, the compressor will run at
its slowest speed.
8 Compressor plug not Disconnect the Module by removing the