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Your Problem is intermittent and is probably a result of a bad connection of the control wires at either the thermostat or at the furnace control board, check all wiring one by one making sure they are tight and none of the individual connection cant touch each other.
I have found t-stat wires touching one another because of the plastic insulation was exposed when it was spliced back a few inches back.
Another possibility is secondary 24v transformer not giving the right voltage. He will need his volt meter to check that.
If he is electrician, he should have enough knowledge to follow wiring diagram in the manual to do this type of work, here is link for manual.
Are replacing fuse because it is burnt or you are using the same one?
If fuse is not burnt means all you are doing is creating a reset to the furnace, When furnace trips out, before you do anything, dont take door off and look through the sight glass in your door and count the amount of light flashes between pauses, this will give you the error code. note that and refer to the list of error codes. this will tell us what is going on. I will attach the list of error codes
Furnace needs to be in lookout to get a error code, all you probably need is a qualified service maintenance on your unit. error codes are listed on the furnace door panel
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