56
4.3 Fault finding
Fault finding,
MHX 85
Use this table to identify and remedy a problem or fault:
Problem
Cause
Action
The red LED illuminates
constantly (=major alarm)
Too high temperature in the
enclosure, above 70°C or a
fan failure
Check if airways are
clear if not clear them.
If alarm does not clear,
replace fan
The red LED is flashing
(=minor alarm)
The on board sensor has
been disconnected/shorted
Replace the controller
The internal fan runs at
low speed
The temperature in the enclo-
sure is below 40°C
This is due to the control
strategy
– no fault
The external fan does not
run
The temperature in the top of
the enclosure is below 30°C
This is due to the control
strategy
– no fault
The external fan runs at
low speed
The temperature in the enclo-
sure is below 45°C
This is due to the control
strategy
– no fault
Fault finding,
MTS4-outdoor en-
closure
Use this table to identify and remedy a problem or fault:
Problem
Cause
Action
No cabin light
LVD disconnected
Connect LVD
Fuse blown
Replace fuse
No DC voltage present
Switch on DC power
Door switch/wiring defective
Check connection of
switch/wiring
Heater not working Thermostat set point incorrect
Adjust set point (see de-
scription below)
Heater set point
The optional heater (located in the back of the shelf in the left side of the enclosure)
will, if power is present, be active when temperature is below set point.
Follow this procedure to adjust set point:
Step
Action
1
Use the dial to adjust the thermostat
set point.
Default setting is 20°C
