Carbolite CFM Series User Manual download pdf (Page 12)

CFM

12 MF10 - 3.08

6.0 FAULT ANALYSIS

A.

Furnace Does Not Heat Up

1.

The HEAT light

is ON



The heating

element has failed



Check also that the SSR is working

correctly

2.

The HEAT light

is OFF



The controller

shows a very high

temperature or a

code such as S.br



The thermocouple has broken or has a

wiring fault



The controller

shows a low

temperature



The door switch(es) (if fitted) may be

faulty or need adjustment



The contactor (if fitted) may be faulty



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



Check the supply fuses and any fuses in the

furnace control compartment



The controller may be faulty or not

receiving a supply due to a faulty switch or

a wiring fault

B.

Furnace Overheats

1.

The HEAT light

goes OFF with

the instrument

switch



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

heating chamber



The thermocouple may be mounted the

wrong way round



The controller may be faulty

2.

The HEAT light

does not go off

with the

instrument

switch



The SSR has failed

“ON”



Check for an accidental wiring fault which

could have overloaded the SSR

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