Find the actual fault
Swapping parts on a guess costs more.
A part swapped on a guess, then another, and nobody ever found the actual fault.
Parts swapping is the expensive way to repair an appliance. Diagnosing properly costs a visit and tells you what's actually wrong, which is what makes the next decision a real one.
That decision should include whether to repair at all. An appliance eight years old needing a control board and a motor is usually a replacement, and a repairer who won't say so isn't doing you a favour.
And installation matters more than people expect. Levelling, venting and connections done properly are the difference between an appliance that lasts its expected life and one that fails in year two.
Swapping parts on a guess costs more.
Repair cost against replacement, plainly.
Gas connections and electrical work beyond the appliance.
Tell us the appliance and the symptoms. We'll quote the diagnostic fee up front.