Operating instructions

TLD
6.0 FAULT ANALYSIS
A. Oven Does Not Heat Up
1.
The SUPPLY light is
OFF
Æ
No power from the
supply
Æ
Check the fuses in the supply
line
2.
The SUPPLY light is
ON
Æ
The controller shows a
very high temperature
or a code such as S.br
Æ
The thermocouple has broken
or has a wiring fault
Æ
The controller shows a
low temperature
Æ
The SSR could be failing to
switch on due to internal
failure, faulty logic wiring
form the controller, or faulty
controller
Æ
There are no lights
glowing on the
controller
Æ
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
Æ
The controller shows a
very high temperature
Æ
The controller is faulty
Æ
The controller shows a
low temperature
Æ
The thermocouple may have
been shorted out or may have
been moved out of the oven
Æ
The thermocouple may be
mounted the wrong way round
Æ
The controller may be faulty
2. Oven heats up when
the instrument switch
is OFF
Æ
The SSR has failed
“ON”
Æ
Check for an accidental wiring
fault which could have
overloaded the SSR
MF18 9