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Why is it taking three weeks?
Five things that fail, crossed with four situations the equipment can be in. What each part is, what it should cost relative to the others, how long it genuinely takes — and what “discontinued” actually means.
Three things that apply to every answer below
- Always ask for the part number
Any technician who has diagnosed a fault knows it, and writing it down takes four seconds. With it you can search the part, see roughly what it costs, and tell whether the quote is a markup or a fiction. Without it you are agreeing to a story. A refusal to give you the number is the answer to your question.
- There are three kinds of wait, and they are not the same
On the van — capacitors, contactors, common filters, fuses. Same visit. At a local counter — most motors, most standard parts, generic boards. Same day or next day. From the manufacturer — model-specific boards, proprietary modules, heat exchangers and compressors for older equipment. Days to weeks, genuinely, and nobody’s fault. Being told which of the three you are in is most of what you need.
- A repair is worth what it buys, not what it costs
The useful question is never just the price. It is the price divided by how much life it buys and set against what a replacement costs. A two-hundred-dollar part on a system with a decade left is obvious. The same part on a system with two years left is a decision, and it is yours to make with both numbers in front of you rather than one.
Work out where you stand
Pick what has failed and pick the situation the equipment is in. Every answer below is on this page whether you pick anything or not — the picker only narrows it down.
This sentence ends more repairs than any other in the trade, and it is said far more often than it is true. Ask which of these it is. One: the supplier does not stock it. Extremely common, and it means nothing — another distributor, an online parts house or a specialist will have it, often the same week. Two: the manufacturer has superseded it. Also common, and also not the end — superseded means there is a replacement part number that fits, and the technician should be able to give it to you. Three: the part is genuinely obsolete with no supersession and no aftermarket equivalent. This does happen, mostly on proprietary boards and modules for equipment that is fifteen or more years old, and it is the one case where the repair really is over. What to ask, in one sentence: “What is the original part number, and has it been superseded?” A contractor who has done the work will answer in ten seconds. One who has not will change the subject to a replacement quote, and now you know which you are dealing with.
Cheap, common, usually same-day. If this is being quoted as a big job, get another quote.
Capacitors and contactors are the two most frequently replaced parts in this trade. They are small, they are standard, and a competent van carries the common sizes. There is no honest version of this that takes a week or costs like a compressor.
What they are and what to expect
A capacitor gives a motor the shove it needs to start and helps it run efficiently. It is a consumable: heat degrades it, and in a hot valley or on a roof it degrades faster. A failing one produces a system that hums but will not start, or that starts sometimes. It is measurable — a reading well below the rated value on the side of the can — and that means it can be caught on a service visit before it strands you.
A contactor is the switch that lets the outdoor unit run. Its contacts burn and eventually stick or fail to close. Also cheap, also standard, also visible on inspection.
What to watch for: a quote that bundles a capacitor into a much larger job without itemising it; a “hard start kit” added as standard rather than because a motor needs one; and a system that has had three capacitors in three years, which is not a capacitor problem but an overheating or airflow problem nobody has looked for.
Get the part number before you agree to anything. Boards are where the price varies most.
Control boards range from a standard item a counter has on a shelf to a proprietary module only the manufacturer makes, and the price range across that span is enormous. Which one you have is a question of the part number and nothing else.
Why boards are the awkward ones
Three things make this part different. They are model-specific far more often than motors or capacitors, which is what drives both the price and the wait. They are frequently a symptom rather than a cause — a board that fails twice has usually been killed by something else, most often a supply problem, a shorted low-voltage wire or a failing component drawing too much. Replacing it without finding that is buying the same part again. And they are the part most often declared unavailable, for the reasons in the note above.
What to ask: the part number, whether it has been superseded, and what the technician thinks killed it. If the answer to the last one is a shrug, the board may well fail again and you should know that before you pay.
On older equipment a universal or aftermarket board sometimes exists and sometimes is a genuinely good answer. It is a legitimate option and it should be offered as one, with the trade-offs stated.
Find out whether it is the motor or the module driving it. On a variable-speed system those are two different parts.
A conventional blower motor is a standard part at a counter. A variable-speed motor is a motor plus an electronic module, the module fails more often than the motor does, and on many systems they can be replaced separately — for a fraction of the price of the assembly.
What decides the cost
- Conventional motors are widely available, frequently replaceable with a correctly matched generic, and usually same-day. Getting the specification right matters more than the brand.
- Variable-speed motors are more expensive and are two parts in one housing. Ask whether the module alone can be replaced; on many models it can.
- Outdoor fan motors sit in the weather and fail from bearings and heat. Standard, available, and worth replacing with the correct rotation and mounting rather than the nearest thing.
Why a motor failed is worth asking too. A blower that has been fighting a blocked filter or a crushed duct for two years will kill its replacement as well, and the duct work is usually the cheaper fix.
This is the decision point. Get the age, the warranty status and the full repair cost in writing before anything is ordered.
A compressor is the most expensive single component, and replacing one is a substantial job even when the part itself is free under warranty. This is the failure where a repair and a replacement genuinely compete, and you should see both numbers.
The three numbers that decide it
- Is the part under warranty? Manufacturers' parts warranties on compressors commonly run longer than on other components, and commonly depend on the equipment having been registered. Read the actual warranty document for the model. If it is covered, the part may cost nothing and the labour, refrigerant and recovery will not.
- What is the full repair cost? Not the part. The part plus labour, recovery, a new filter drier, refrigerant, and a system flush where the failure was a burnout. That total is the number to compare.
- What refrigerant is it on? Older refrigerants get progressively harder and more expensive to obtain as they are phased down, and that changes the arithmetic on any system that will need charging again.
And one thing we will say plainly: a compressor that has burned out has contaminated the system, and a repair that skips the clean-up is a repair that fails again. If a quote does not mention a filter drier, ask why.
Stop using it until it has been verified — and get the evidence. Then it is a warranty question before it is a repair question.
A cracked heat exchanger is a genuine reason to shut a furnace down, and it is also the most abused finding in this trade. Both of those are true at once, which is why the evidence matters so much.
Evidence first, then arithmetic
What proper evidence looks like: a camera image of the crack, or a combustion analysis showing a change in readings when the blower runs, or a visible flame disturbance recorded on the day. What it does not look like is a verbal assertion followed immediately by a replacement quote. You are entitled to see it, and you are entitled to have somebody else look before you spend anything. Meanwhile, do not use the appliance.
Then the arithmetic. Heat exchangers frequently carry a long parts warranty, sometimes twenty years or the life of the original owner, and it commonly does not transfer. So: read the warranty document for the model. If the part is covered the labour will not be, and on many furnaces that labour is most of a day, because it means taking the appliance apart.
That is why a covered heat exchanger so often still ends in replacement, and it is a legitimate outcome rather than a trick. What makes it a trick is when it happens without the evidence and without the warranty being checked.
Under ten years, probably in warranty
Then the first question is not the part, it is the paperwork. Find the model and serial numbers and check the manufacturer’s registration and warranty status before anything is ordered, because a part bought over the counter cannot be claimed afterwards.
Two things catch people. Warranties commonly require registration within a short window after installation, and a system installed by somebody else may or may not have been registered. And a parts warranty is a parts warranty — labour, refrigerant and recovery are yours unless the installer sold a separate labour warranty.
The other useful thing at this age: a component failing early is a signal. Ask what the technician thinks caused it, because a system that eats parts in its first decade usually has an installation problem — airflow, charge or electrical — and fixing that is worth more than the part.
Ten to twenty years old
The ordinary middle, and the range where almost every repair on this page is worth doing. Parts are available, the equipment has life in it, and the arithmetic is straightforward unless the failure is a compressor or a heat exchanger.
What changes in this band is that the parts history starts to matter. One failure is a failure. Three in two years is a pattern, and a pattern is the thing that should trigger a replacement conversation — not a birthday. That is exactly why we keep the sheet.
It is also the band where refrigerant becomes a live question on cooling equipment, because the older refrigerants get steadily more expensive to obtain. A system that needs gas every year is telling you something the age alone is not.
Over twenty years old
Here the honest position is that any repair is buying time, and the only question is how much time for how much money. We will still do it, and we will still tell you the part number and the price. What we will not do is pretend a capacitor makes it new, and we will not pretend age alone makes it scrap either.
A twenty-five-year-old system that is correctly charged, moves the air it should and passes its safety checks is a working system, and there are a great many of them in this city doing perfectly well. What is different is the sums: a large repair on equipment with limited life left is money in the wrong place, and a small one usually is not.
The thing genuinely worth doing at this age is planning rather than replacing. Knowing what a replacement would cost, what it would involve and how long it takes — before the failure — turns an emergency into a decision. We will quote that for nothing and you can put it in a drawer.
You have been told the part is unavailable
Read the note above, because it is the substance. What to do practically: get the original part number in writing, ask whether it has been superseded, and if you want a second view, ring a parts distributor yourself and read them the number. They will tell you in a minute and it costs nothing.
Where it turns out to be genuinely obsolete, the options are narrower but not always zero: a used or refurbished board from a specialist, an aftermarket universal where one exists and suits, or a control retrofit that replaces a proprietary board with a standard one. All three are legitimate, all three have trade-offs, and all three should be put in front of you rather than skipped.
And if the answer really is that the repair is over, that is a proper answer and we will say it. What we will not do is say it without having looked, because it is the most profitable sentence in this trade.
Where this page stops
We will diagnose with instruments, name the part, give you the number, the price and the honest wait in writing, and quote the replacement alongside the repair whenever the two genuinely compete. We keep a parts history per building so the decision is arithmetic rather than argument.
We will not say a part is unavailable without checking, will not order anything before you have the number, and will not condemn a heat exchanger without showing you the evidence. If a gas appliance is suspect, do not use it until it has been verified — that is the one item here that does not wait.