When repairing oil heaters, it is worth stocking up on several things:

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Position sensor Present in most powerful fan heaters and some models of oil heaters. The test is simple: if the sensor is working, then when the device is tilted, it opens the circuit.
In the vertical position, the resistance is almost zero. The test can be carried out with any continuity tester. If the sensor is broken, it is replaced entirely.
Regulator. Carbon deposits and oxides in temperature regulators are a common cause of heater failure. The elements must be disassembled, thoroughly cleaned with fine sandpaper, and wiped with alcohol.

Temperature sensor, thermostat . The device of the temperature sensor is quite simple. Inside the mechanical unit responsible for opening the circuit at a certain temperature, there is a bimetallic plate. You need to saudi arabia telegram data set the regulator to minimum, take out the element, inspect for traces of carbon deposits, cracks, delamination, any oxides and deposits. If any, the plate should be replaced.
Quartz resonator . Present in ceramic heaters, the change in its parameters develops over time, as a result of which the device ceases to obey the regulators. The part must be replaced, other repair of the heater is impossible.

To eliminate other faults, experience in electrical work, the ability to test the parameters of the heating element, motor windings, starting capacitors and the condition of other units are required. Therefore, it is irrational to dwell on this in detail, especially since each class of heaters has its own characteristics.

In conclusion
In conclusion, here are a few more tips.

Firstly, a container for draining transformer oil if you need to change the heating element or seal a leak.
Secondly, with a special sealant, which is used to treat the gasket area after installing the heating element.
Thirdly, the presence of a powerful soldering iron and special fluxes to eliminate small leaks along the seams. Sealants, glues, and putties of various kinds are not suitable for this.