Carbolite ABF 8/28 - Manual (Page 11)

MF58 – 1.06 11
5.0 F AULT F INDING
Disconnect the equipment from the supply before carrying out any internal investigation.
Furnace Does Not Heat Up
The Heat lamp
is On
 The heating element
has failed
 Check also that the SSR is working correctly
The Heat lamp
is Off
 The controller shows a
very high temperature
or a code such as S.br
 The thermocouple may have broken or may have a
wiring fault
 The controller shows a
low temperature
 The door switch may be faulty
 A relay may be faulty
 The SSR could be failing to switch on due to
internal failure, faulty logic wiring from the
controller, or faulty controller
 There are no lamps
glowing on the
controller
 Check the supply fuses and any fuses in the control
compartment
 The controller may be faulty or not receiving a
supply due to a faulty switch or a wiring fault
Furnace Slow To Heat Up
One of the Heat lamps does
not light
 A fuse may have
blown
 Check the Supply fuses
The Heat lamps all light up
 An element may
have failed
Furnace Overheats
The Heat lamp goes Off with
the instrument switch
 The controller
shows a very high
temperature
 The controller may be 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
The Heat lamp does not go off
with the instrument switch
 The SSR has
failed “ON”
 Check for an accidental wiring fault which
could have overloaded the SSR
Chimney Emits Smoke
Some light smoke is emitted
in the middle of the test
 No fault
Dense smoke is emitted
 The after-burner chamber
temperature may not be set
high enough
 Set the secondary controller
temperature to 900°C
 The after-burner elements
or control may have failed
 Investigate or contact Carbolite
 A fuse may have blown  Check the Supply fuses