B.
Product 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
furnace.
The thermocouple may be
connected the wrong way
around.
The controller may be faulty.
2.
The HEAT light does
not go off with the
instrument switch
and the fault persists
when a 2 A control
fuse is removed from
its fuse-holder.
The power
thyristor has failed
"ON".
Check for an accidental
wiring fault which could have
overloaded the thyristor.
Isolate the furnace if this
fault persists.
57
9.0 Fault Analysis
Summary of Contents for CARBOLITE GERO HTF 18/15
Page 36: ...4 0 3508 Dual Loop Cascade Power Limit View 36 ...
Page 55: ...Element Connections 1 phase Element Connections 3 phase 55 8 0 Repairs and Replacements ...
Page 58: ...10 0 Wiring Diagrams 10 0 Wiring Diagrams 10 1 239 4 5001 58 ...
Page 61: ...Notes Service Record Engineer Name Date Record of Work ...