10
Cause: Cable may be cut or short-circuited.
Device Response: If the system detects an error while in the stop mode, the system will not operate
and an error will appear on the screen. If the pump is short-circuited while the system is running, the
system will likely go into stop mode by cooling to detect that the flame has gone out (E19) or that the
combustion has not started (E15).
Troubleshooting:
* Check the fuel pump cable and connectors.
* Disconnect the fuel pump connector, if fault code E03 (Fuel Pump Open Circuit) is displayed, the fuel
pump is faulty. Replace the fuel pump.
* If the fault code E04 remains the same, disconnect the connector YH External connector J8-J9 and
check that pin 3 (blue wire) on J9 is shorted to ground (pin 1) to the fuel pump. If it is OK, replace YHC.
E 04 : Fuel Pump High Current
Cause: The cable may be cut or the socket may be disconnected. The fan motor may have failed.
Device Response: If the system detects an error while in the stop mode, the system will not operate
and an error will appear on the screen. If the fan motor is open while the system is running, the system
will likely go into stop mode by cooling to detect that the flame has gone out (E19), that the combustion
has not started (E15), or that the fan will detect a malfunction.
Troubleshooting:
* Check the fan motor cable and sockets.
* Unplug the fan motor cable from the YHC and perform a resistance test. If the resistance test is
smooth; Replace the YHC.
* Reset the device from the button or disconnect the system from the power supply and connect again.
E 05 : Blower Motor Open Circuit
Cause: Cable may be cut or short-circuited. If any part enters the suction impeller side while the
device is operating, this malfunction may occur as a result of the fan's current rise if an impeller
prevents rotation of the impeller. If the magnetic field reader on the YHC is prevented from seeing the
impeller, this fault may occur as the current will rise again.
Device Response: If the system detects an error while in the stop mode, the system will not operate
and an error will appear on the screen. If the fan motor overcurrent detection occurs while the system
is running, the system will go to stop mode.
Troubleshooting:
* Check the fan motor cable, sockets, and device impeller to prevent operation.
* Apply current test to the fan motor. To do so, pull the socket out of the motherboard.
Apply 8v voltage to the fan motor for 12v, 18v for 24v, and measure the current strength after 40
seconds.
Current strength = <6A - Fan motor is OK. Replace the YHC.
Current> 6A - Replace fan.
* Reset the device from the button or de-energize the system. Restart the device if the error is
corrected and the system will continue to run smoothly.
E 06 : Blower Motor High Current
