Carbolite AX120 - Manual (Page 10)

Apex Series Ovens
10
MF42 1.10
6.0 F AULT A NALYSIS
A. Oven Does Not Heat Up
1. The temperature
controller is OFF
 No power from the
supply
 Check the fuses in the supply
line
 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
2. The temperature
controller is ON
 The controller shows a
very high temperature
or a code such as EEE or
---
 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
form the controller, or faulty
controller
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 temperature sensor may
not be positioned in the oven
correctly
 The controller may be faulty
2. Oven heats up when
the instrument switch
is OFF
 The SSR has failed
“ON”
 Check for an accidental wiring
fault that could have
overloaded the SSR
C. Process Timer
Oven will not heat
 Temperature controller
does not light up
 Process timer has not been
reset
 Resetting the timer has
no effect
 Process timer is faulty (relay
stuck open)
Oven continues to heat
at end of process time
 Process timer OUT light
is continuously on
 Process timer is faulty (relay
stuck closed)
 OUT light flashing or
off
 not a process timer fault