When you say "failing to start", what do you mean?
These units are usually controlled by a room thermostat, so if the thermostat doesn't switch then the fan motor won't run.
If you're sure that the thermostat is fine, and that all other isolating switches are fine, then it sounds like it's time for a motor rewind. This won't be cheap, but is commonly the cheapest option for an old unit.
By failing to start I mean that the fan which blows air through the heated blocks doesn't turn, but apparently this is intermittent. The heater elements seem to work OK.
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