Carbolite CAF DIGITAL IMAGING - 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