Scale is the number one reason coffee machines in Gqeberha end up on our workbench. Descaling properly and regularly prevents most of those repairs. Here is how to do it right, how often, and the mistakes that cause damage.

Quick answer

Use a descaler made for coffee machines (not vinegar unless your manufacturer allows it), remove the water filter, follow your machine's descale programme from start to finish without interrupting it, rinse thoroughly, and refit a new filter. Descale whenever the machine prompts, and more often if your water is hard or you do not use a filter.

What scale does

When water is heated, minerals dissolved in it, mainly calcium and magnesium, come out of solution and stick to hot surfaces. In a coffee machine, that means the heater or thermoblock, the pipes and the valves. Over time:

  • The heater has to work through an insulating crust, so coffee comes out cooler.
  • Narrowed pipes and valves reduce flow, so coffee is weaker and slower.
  • The pump strains against the restriction and gets noisier.
  • Eventually, valves stick, flow stops and the heater can fail.

Gqeberha's municipal water is moderately hard in many areas, and machines used daily build up scale steadily. In surrounding areas with borehole water, it is much faster.

How often to descale

  • When the machine asks. Most bean-to-cup machines have a descale warning based on the volume of water used and the hardness setting.
  • Set the hardness correctly. Many machines come with a test strip. Use it, and set the hardness in the menu so the warning comes at the right time.
  • More often without a filter. If you do not use the machine's water filter, descale more often.
  • Manual espresso machines without a prompt: every one to three months for daily use, depending on water hardness.

Choosing a descaler

  • Use a descaler made for coffee machines. Many are based on lactic, citric or sulfamic acids, formulated to dissolve scale without damaging seals and metal parts.
  • Check your manual. Some manufacturers specify their own descaler, and using something else may affect your warranty.
  • Be careful with vinegar. Some manufacturers advise against it, as it can be harsh on seals and leave a lingering smell and taste. Follow your manual.
  • Never use bleach or general bathroom limescale removers.

Step by step: bean-to-cup machines

Most fully automatic machines have a guided descale programme. The general steps are:

1. Empty the drip tray and grounds container. 2. Remove the water filter if one is fitted. Descaler should not run through it. 3. Mix the descaler with water in the tank according to the product instructions. 4. Place a large container under the coffee spout and the milk or hot water outlet. Descaling uses a lot of liquid. 5. Start the descale programme from the menu. 6. Let it run to the end. Do not switch off or interrupt it. Interrupted programmes can leave descaler inside the machine. 7. Rinse. The machine will ask you to empty and refill the tank with clean water for a rinse cycle. Do this thoroughly. 8. Fit a new water filter if you use one, and register it in the menu. 9. Discard the first coffee or two.

Step by step: manual espresso machines

1. Mix descaler and water in the tank. 2. Run some solution through the group head and the steam wand, then switch off and let it sit for the time recommended by the descaler. 3. Run the rest of the solution through, alternating between the group head and steam wand. 4. Rinse the tank and run at least one full tank of clean water through both. 5. Clean the group head screen and gasket while you are at it.

Mistakes that cause damage

  • Interrupting the programme. Descaler left inside can damage seals.
  • Leaving the water filter in. It gets ruined and can release trapped material.
  • Using too strong a solution. More is not better. It can damage components.
  • Skipping the rinse. Descaler residue affects taste and can attack parts.
  • Waiting too long. Heavy scale may not fully dissolve with a home descale and can break loose to block valves. If your machine is already struggling, a professional descale may be needed.

When home descaling is not enough

If after descaling your coffee is still weak or cold, flow is still slow, the pump is very noisy or the machine shows errors, scale may have already blocked a valve or damaged the heater. A professional service can strip, descale and replace damaged parts.

We repair and service coffee machines throughout Gqeberha for homes, offices and cafes.

Frequently asked questions

Can I use vinegar to descale my coffee machine?

Check your manual. Many manufacturers recommend a dedicated coffee machine descaler and advise against vinegar.

What happens if I never descale?

Scale builds up until coffee is weak and cold, flow slows and eventually valves block or the heater fails.

Do I need to descale if I use a water filter?

Yes, but less often. Filters reduce scale but do not eliminate it.

Apex HVAC is an independent company and is not affiliated with or authorised by any appliance manufacturer. This guide is general advice. For anything involving electricity or refrigerant gas, use a qualified technician.

Need a hand? See our coffee machine repair service in Port Elizabeth (Gqeberha).