Sometimes the door malfunctions are associated with the aging of the door elements or natural wear. Or the malfunctions may appear when improper operation due to mechanical damage. Only simple malfunctions can be eliminated independently.
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In case of malfunction of the door handle, or rather, when cracks appear on it, you need to turn the plate 90 degrees at its base, where two screws will be visible. When extracting an old pen, you can replace with a new.
Sometimes the door handle turns out to be accidentally turned, where, with any attempt, the door may not close. Here the rotary operation of the lock prevents the handle. Using a small metal tongue protruding at an angle at the end below the handle, you can return to the right position. Sometimes the reason may be the temperature deformation of the window, where the tongue slips past the mechanism. To eliminate the malfunction, you need to unscrew the return plate and put the gasket with a thickness of 2-3 mm.
The reason for the difficult rotation of the handle may dry the lubricant, where all moving elements should be lubricated with lubricants. Or the reason may be a sagging door. To do this, remove the door from the loops and adjust.