9
to the desired set point as described in section 5-1 of the
operation manual.
If after making sure the heat control has been set for
farenheit and uncontrollable,runaway heat persists,you
should now consult your dealer,a servicing dealer tech,the
Ledco service dept.,or move on to the next,Intermediate,
troubleshooting level.
2)
Intermediate/Advanced.
Disconnect the power cord
and remove the the right side housing as described
previously.Visually examine all wires for the heat system for
disconnected,broken or shorted-out wires.Pay particular
attention to the heat sensor wires.Re-connect or replace any
disconnected or broken/shorted wires and rewire them
exactly as shown in schematic.If symptoms persist,using a
multimeter check the heat sensor wires(you will have to
remove the bottom,back motor cover as instructed in the
previous section to gain access to the heat control board
and wiring thereof)with at least one wire disconnected from
its heat board terminal.As noted before,a fuctional heat
sensor reads 1.089 ohms resistance at room temperature,
an open reading means there would be no heat and a
closed reading(dead short)results in runaway,uncontrollable
heat.Either open or closed readings indicate heat sensor
failure and require replacement of the PRC212S heat
sensor and 4285 061.4 bullet and rewiring exactly as shown
in schematic.
Next,using your multimeter,check terminals T10 andT11
on the heat control board(the terminals for the heat sensor
wires).As described in the previous section,you should get a
reading of approximately 32.9
k
ohms resistance.An open or