8.0 Fault Analysis
8.0
Fault Analysis
A.
Furnace Does Not Heat Up
1.
The HEAT
light is ON
The heating element
has failed
Check also that the SSR is working
correctly
2.
The HEAT
light is OFF
The controller shows a
very high temperature
or code such as S.br
The thermocouple has broken or has
a wiring fault
The controller shows a
low temperature
The door switch(es) (if fitted) may
be faulty or need adjustment
The contactor/relay (if fitted) may
be faulty
The heater switch (if fitted) may be
faulty or need adjustment
The SSR could be failing to switch on
due to internal failure, faulty logic
wiring from the controller, or faulty
controller
There are no lights
glowing on the
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.
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