Carbolite CAF DIGITAL IMAGING User Manual
Page 28
Caf Digital Imaging
page 28
MF36-3.21
7.0
F
AULT
A
NALYSIS
.
A general fault analysis chart can be seen below; see section 4.0: Operating Instructions, for
more detailed fault analysis of the control system.
A. Furnace Does Not Heat Up
1.
The HEAT light
is ON
An ohm meter applied
to the element circuit
shows an open circuit
A heating element has failed
2.
The HEAT light
is OFF
The controller shows a
very high temperature
or a code such as S.br
There are no lights
glowing on the
controller
The thermocouple has broken or has
a wiring fault
Check the supply fuses and any fuses
in the furnace control compartment
The controller may be faulty or not
receiving a supply due to a faulty
switch or a wiring fault
B. Furnace Overheats
1.
The HEAT light goes
OFF with the
instrument switch
The controller shows
a very high
temperature
The controller is faulty
The controller shows
a low temperature
The thermocouple may have been
shorted out or may have been moved
out of the heating chamber
The thermocouple may be mounted the
wrong way round
The controller may be faulty