MCS BV 170E - The Electrodes Make a Spark but the Motor Does Not Run; The Motor Starts but the Heater Does Not Ignite

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2. Connect the heater to the power plug and try to turn it on
3. Verify that pump pressure is the same as indicated in the attached technical tables and, if this is not
the case, turn the specific adjustment screw to restore the correct value (see section 4 under the
item fuel system)
D. Dirty or damaged nozzle
1. Remove the upper mantle
2. Remove the combustion head from the combustion chamber
3. Remove the nozzle from the combustion head
4. If the nozzle is dirty, do not try to clean it by inserting wires into the fuel outlet. Place the nozzle in a
non-flammable solvent and use compressed air to remove any dirt from the nozzle. Replace the worn
or damaged nozzle with a new one (See section 4 under the fuel system item)
Observed problem: The electrodes make a spark but the motor does not run
Possible cause
A. Seized fuel pump
B. Defective motor
C. Motor in thermal protection
D. Defective relay
Repair procedure
A. Seized fuel pump
1. Disconnect the heater from the power plug
2. Remove the upper mantle
3. Rotate the fan and establish if the pump is free to rotate
4. If the fan rotates with difficulty or if it is blocked, loosen the three dowels keeping the pump fastened
to the motor
5. Replace the pump if necessary
B. Defective motor
1. Disconnect the heater from the electrical power supply
2. Disconnect the control panel and remove the wires powering the motor
3. Connect the ohmmeter lead wires to the blue and brown wires and verify that the motor resistance is
not null. If this were not the case, the motor is defective and must be replaced. Properly adjust the
ohmmeter scale
C. Motor in thermal protection
1. Disconnect the heater from the electrical power
2. If the thermal protection has tripped in the motor, it should be very hot. If that is the case, let it cool
down and then try to turn it on again
D. Defective relay
1. Disconnect the heater from the electrical plug
2. Take apart the electrical panel and check the condition of the relay. When it intervenes, it makes a
typical noise that may help establish if it is broken or not
Observed problem: The motor starts but the heater does not ignite
Possible cause, if a spark is not observed at the spark plug
A. Incorrect electrode positioning
B. Defective equipment
C. Broken electrode
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