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Caf Digital Imaging
7.0
F
A
AULT
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
2.
The HEAT light
is OFF
B. Furnace Overheats
1.
The HEAT light goes
OFF with the
instrument switch
page 28
.
à An ohm meter applied
to the element circuit
shows an open circuit
The controller shows a
very high temperature
or a code such as S.br
There are no
lights glowing
on the
controller
à The controller shows a
very high temperature
à The controller shows a
low temperature
à A heating element has failed
à The thermocouple has broken or has
a wiring fault
à The SUPPLY
à The controller may be
light is ON
à The SUPPLY
à Check the supply fuses
light is OFF
à The controller is faulty
à The thermocouple may have been
shorted out or may have been moved
out of the heating chamber
à The thermocouple may be mounted the
wrong way round
à The controller may be faulty
faulty or not receiving a
supply due to a faulty
switch or a wiring fault
and any fuses in the
furnace control
compartment
MF36
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