Fault Analysis - Carbolite GHA Installation, Operation & Maintenance Instructions Manual

G range
6.0 F A
AULT NALYSIS
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
2.
The HEAT light
does not go off
with the
instrument
switch
14
 The heating
element has failed
 The controller
shows a very high
temperature or a
code such as S.br
 The controller
shows a low
temperature
 There are no lights
glowing on the
controller
 The controller
shows a very high
temperature
 The controller
shows a low
temperature
 The SSR has failed
"ON"
 Check also that the SSR is working
correctly
 The thermocouple has broken or has a
wiring fault
 The heater switch may be faulty or need
adjustment
 The contactor (if fitted) may be faulty
 The SSR could be failing to switch on due
to internal failure, faulty logic wiring from
the controller, or faulty controller
 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
 The controller is faulty
 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
 Check for an accidental wiring fault which
could have overloaded the SSR
MF48 -1.18