8.0 Fault Analysis
8.0
Fault Analysis
A.
Oven Does Not Heat Up
1.
The
temperature
controller is
OFF
No power from
supply
Check the fuses in the supply line
2.
The
temperature
controller is
ON
The controller
shows a very high
temperature or a
code such as EEE
or --- or S.br
The temperature sensor has broken
or has a wiring fault
The controller
shows a low
temperature
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
The controller may be faulty or not
receiving a supply due to a faulty
switch or a wiring fault
B.
Oven Overheats
1.
Oven only
heats up
when the
instrument
switch is ON
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 oven
The thermocouple may be
connected the wrong way round
The controller may be faulty
2.
Oven heats
up when the
instrument
switch is OFF
The SSR has failed
"ON"
Replace the SSR. Check for an
accidental wiring fault which could
have overloaded the SSR
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