COMBITHERM® SERVICE and TROUBLE SHOOTING
COMBITHERM INSTALLATION AND MAINTENANCE MANUAL #6004/18
PG. 23
CONDENSER TROUBLE (CONTINUED)
12. Water does not flow through
solenoid valve into condenser.
CONVECTION TROUBLE
13. Unit does not heat in
convection or superheated
steam programs.
14. Unit does not heat in
convection or superheated
steam programs but the
convection LED indicator light
is illuminated.
GENERAL TROUBLE
15. Control fuse blows when power
switch is turned to the ON
position.
16. Fuse on PC board blows
approximately 6 to 7 minutes
into oven operation.
17. All oven function operate but
audible signal does not
activate.
18. None of the oven functions
operate after switching the unit
ON but interior oven light(s)
illuminate.
19. Interior oven light or lights do
not illuminate.
a) Sensor B3 is defective.
b) Bad wire connection between
coil Y2 and multi-pin plug
X5/1 and X5/11 on PC board.
c) Solenoid valve is defective.
d) Solenoid valve Y2 remains
closed.
e) Coil Y2 is defective.
a) A fuse is blown.
b) Contactor is defective which
could include K41, K42, K61,
and/or K62.
c) Thermostat is defective.
d) Loose wire connection between
X5/8 or X5/1 and contactors.
e) Safety Thermostat (N7) for
convection heater has shut off.
a) Convection heating element is
defective.
b) Over-ride thermostat is
defective or has tripped (N7).
c) Loose wire connection.
a) Short circuit of electrical coils.
b) Bad wire connection(s).
a) Solenoid valve coil Y2 for
cooling is short circuited.
a) Audible signal on diode board
may be defective.
a) Fuse F1 is defective.
b) Operation board or connection
to board is defective.
a) Interior oven light is burned
out.
b) Light socket is defective.
c) Fuse F2 or F3 on PC board
is blown.
Replace sensor B3.
Check wire connection.
Replace solenoid valve.
Check solenoid valve. Check
continuity between coil Y2 and
multi-pin plug X5/1 and X5/11 on
PC board.
Replace coil Y2.
Replace fuse.
Replace contactor.
Replace thermostat.
Check wire connection.
Push red button on saftey
thermostat (N7).
Replace convection heating
element.
Replace over-ride thermostat.
Check wire connection or reset
thermostat.
Replace defective coils (
CONTACTORS).
Check all wires for tight
connections.
Replace coil Y2 of solenoid valve.
Replace diode board.
Replace fuse.
Check connection and/or replace
operation board or wire.
Replace light bulb.
Replace light socket.
Replace fuse F2 or F3.
PROBLEM POSSIBLE CAUSE REMEDY
PRIOR TO STARTING SERVICE WORK, THE OVEN MUST BE DISCONNECTED FROM THE POWER SOURCE.
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