Jim Engineering HT User Manual

TROUBLESHOOTING GUIDE
Cabinet appears 'dead'. Check that the power lead is correctly fitted into a working socket
and also pushed firmly into the rear connector on the cabinet. Check that the cabinet is
switched on using the illuminated green power switch on the front of the cabinet.
Temperature is erratic. This is usually caused by over-filling the cabinet.
Overheat red safety light is permanently on. The cabinet will not be heating above the safety
dial setting even if the operating temperature is set higher. If safe, increase the safety setting.
Cabinet is not heating.
1 Is the red safety light on? Adjust operating temperature and/or safety dial. The
amber heat light should now come on and the cabinet should be warming up.
If the amber light is on but the cabinet is not heating the problem will probably be
either a faulty overheat safety thermostat or heating element.
2 On fan models if the cabinet is warm at the top and hot at the base it will
probably be the fan at fault. Replace the fan. Fan failures are usually the result of
spillages not being cleaned up properly. You can hear the fan working if you listen
close to the cabinet or open the door a little.
There is a nasty smell. The usual cause is that a spillage has not been cleaned away properly and
that fluids have reached the heating element which has started scorching the residue. On some
models a nasty smell can be caused as a result of overheating a seized fan motor. Replace both
the fan motor and cooling fan blade.
Amber light keeps going on and off. This is normal operation and is not a fault.
Safety thermostat reads incorrectly. This is caused by someone forcing the dial knob. Gently
force the dial knob back – clockwise to decrease the reading and anticlockwise to increase the
reading.
Door won't close properly. The door roller catch mechanism needs adjustment or replacing.
If in doubt please call your supplier.
USER MANUAL FOR
JIM ENGINEERING
HIGH TEMPERATURE
LABORATORY OVENS
LHT & HT MODELS
Jim Engineering Ltd.
Unit 2 Ravenhead Business Park
11 Ravenhead Road
St Helens
Merseyside WA10 3DB
Tel: 01744 322377 & 302862
www.jimengineering.com
info@jimengineering.com
Issued June 2015