What owners and operators actually describe when they call, and where each of those descriptions is covered on this site. It is a way into the right page, not a diagnosis. One symptom on its own does not identify a fault on any of this equipment, which is why every entry points at the section that sets out the systems involved.
Find the line closest to what your machine is doing and follow it. The page it opens explains the equipment and the systems that can produce that behaviour, states what we repair and what we replace, and sets out how a job runs. If nothing here matches, that is common and not a problem: send the model and what changed and we will tell you what can be established.
It will not tell you which part has failed. Every one of these descriptions is produced by more than one cause, and on most of this equipment the cheapest explanations look exactly like the expensive ones from the outside. Narrowing it is what an evaluation is for, and the written findings say what was measured and what remains unknown.
The list is what we have written up, not the limit of what we work on. Describe it in your own words, send the manufacturer and model, and add a photograph of the label if you have one.
Five fields is enough to start. We reply with an assessment and, where bench work makes sense, a written diagnostic scope and a fixed fee for your approval.