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5.
Periodically check the connections among the oil tube, the pump
and the heater to see if there’s oil leaking. If positive, lock tight the
connections carefully with proper tool.
6.
PC board should be kept from being dirtied with oil. In case this
happened, dismantle carefully the PCB, and have it brushed
clean both sides with dilute alcohol. Leave it dry itself, then install it
back. Make sure all wires are well connected.
7.
Clean the metal cover with dry cloth.