The short answer
The maintenance jobs households skip are almost never the obvious ones — they are the parts hidden behind panels. The twelve that matter most: the water heater anode rod (every 2–3 years, and it decides whether the tank lasts 8 years or 18), the washing machine drain pump filter (3 months), the dryer duct rather than just the lint screen (annually), refrigerator condenser coils (6–12 months), the microwave waveguide cover, the bathroom fan impeller, the dishwasher filter (2–6 weeks), smoke alarm expiry dates rather than batteries, sump pump testing with water, felt pads under furniture, grout and silicone seals, and the fridge drain pan.
Most household maintenance failures are not caused by neglect of the obvious jobs. They are caused by the parts nobody knows exist — the filter behind a panel, the rod inside a tank, the channel under a rubber seal. Here are twelve of them, ordered roughly by how much they cost when ignored.
1. The water heater anode rod
A magnesium or aluminium rod inside the tank that corrodes instead of the steel. When it is used up, the tank starts corroding — and a corroded tank is not repairable. Replacing a rod every two to three years can roughly double a heater’s life for the cost of one part.
Interval: inspect every 2–3 years. Full guide
2. The washing machine drain pump filter
Behind the small panel at the bottom front. It holds standing water permanently, and on a machine that has never had it opened it is very often the actual source of a musty smell people blame on the drum.
Interval: every 3 months. Full guide
3. The dryer duct — not just the lint screen
The screen catches part of the lint; the rest accumulates in the duct. A household that has cleaned the screen after every load for eight years can still have a duct two-thirds blocked, which is both an efficiency problem and a fire load.
Interval: annually. Full guide
4. The refrigerator condenser coils
Dust on the coils means heat cannot leave, so the compressor runs almost continuously. Twenty minutes with a brush and a vacuum, twice a year, is the best return of any appliance job.
Interval: every 6–12 months. Full guide
5. The microwave waveguide cover
The small mica panel on the side wall. Splatter carbonises on it, carbon absorbs microwave energy instead of passing it, and the result is arcing that can destroy the magnetron.
Interval: inspect monthly. Full guide
6. The bathroom extractor fan impeller
A fan with a dust-loaded impeller sounds exactly like a working fan and moves almost no air. Hold a sheet of tissue to the grille — it should stay there unaided.
Interval: every 6 months. Full guide
7. The dishwasher filter
Machines built after roughly 2010 have a manual filter instead of a food grinder. Nobody told most owners. Gritty glasses and standing water are the symptoms.
Interval: every 2–6 weeks. Full guide
8. Smoke alarm expiry dates — not batteries
The test button checks the battery and the sounder, not the sensor. Sensors degrade whether or not the alarm is used, so a ten-year-old unit can beep on test and still fail in a fire.
Interval: check the manufacture date annually; replace at 10 years. Full guide
9. Sump pump testing — with water, not by hand
Lifting the float confirms the pump runs but skips the float switch, which is the most common failure point. Pour water in instead.
Interval: quarterly. Full guide
10. Felt pads under furniture
Pads collect grit and become abrasive discs. A pad you fitted two years ago and never looked at is doing damage rather than preventing it.
Interval: inspect every 6 months. Full guide
11. Grout and silicone seals
Sealer stops grout absorbing; silicone stops water reaching the wall. Both are consumables with a service life of a few years, and both fail quietly.
Interval: test the grout seal annually. Full guide
12. The fridge drain pan
A shallow tray under the compressor that catches defrost water. It collects sludge and is a common source of a persistent smell people chase inside the cabinet for months.
Interval: annually, while cleaning the coils. Full guide
The whole list on one schedule
| Interval | Jobs |
|---|---|
| Monthly | Dishwasher filter, microwave waveguide inspection, smoke alarm test |
| Quarterly | Washer drain pump filter, sump pump test |
| Every 6 months | Fridge coils, extractor fan impeller, felt pads, grout seal test |
| Annually | Dryer duct, water heater flush, fridge drain pan, alarm expiry dates |
| Every 2–3 years | Water heater anode rod |
Common questions
Which of these matters most if I only do one?
The water heater anode rod, on cost. A tank that corrodes through is a replacement, not a repair, and the rod is the single component that determines whether that happens at year eight or year eighteen. The dryer duct is a close second on safety grounds.
Why do so many of these involve filters?
Because manufacturers moved from self-cleaning mechanisms to user-serviced ones for efficiency and noise — the dishwasher food grinder became a manual filter, and cyclonic systems became replaceable cartridges. The design change was never communicated to owners, so an entire category of maintenance quietly stopped happening.
Is there a way to remember all of this?
Put the quarterly and annual items in a calendar with a recurring reminder, and attach the monthly ones to something you already do — the dishwasher filter when you run out of tablets, the smoke alarm test when the clocks change. Interval-based maintenance fails when it depends on memory.
How do I know if a job has already been neglected too long?
Most of these give a warning before they fail: a compressor that never stops, a dryer needing two cycles, a musty smell that returns within days of cleaning, a fan that will not hold tissue. If any of those describe your house, start there rather than at the top of this list.
Do any of these need a professional?
None of the twelve. What does need one: anything on a gas supply, inside a main electrical panel, structural, or involving refrigerant. Those lines are set out in our disclaimer, and every individual guide says where it stops.