Grant Instruments BTDL - Manual (Page 10)

SYMPTOM POSSIBLE CAUSE ACTION REQUIRED
NO DISPLAY
Unit not switched on.
Unit not connected to power supply.
Power supply failure.
Fuse blown in unit or plug (UK units
only).
Switch on.
Connect to power supply.
Check that other electrical appliances
on the same circuit are working.
Check and replace (see 6.2).
5. Fault diagnosis
TEMPERATURE DOES
NOT RISE WHEN
EXPECTED
TEMPERATURE CONTINUES
TO RISE WHEN
NOT EXPECTED
Set temperature is lower than block
temperature.
Set temperature is too close to
ambient.
Thermal fuse has operated.
Temperature control circuit fault.
Check set temperature.
Raise set temperature.
Have BTD thermal fuse replaced by a
competent person.
Have unit checked by competent
person.
Set temperature is higher than the
block temperature.
Temperature control circuit fault.
Check setting.
Have unit checked by competent
person.
Page 10
BTD/BTDL
Operating instructions
Version 7 - May 2011