Breville Heating Element Replacement Guide (Barista Express, Pro, Bambino Plus)

When Descaling Doesn't Fix a Cold Breville

Every Breville "not heating" guide tells you to descale first, and for good reason — scale buildup is the cause more often than not. But every one of those guides also ends with the same shrug: if descaling didn't fix it, the heating element itself has probably failed, and here's roughly what a replacement part costs. None of them walk through actually doing it. This guide covers that last step across Breville's four main machine lines, since the disassembly and the part itself are different for each.

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Confirm the Element, Not Something Else, Has Failed

Before ordering a part, rule out the cheaper causes:

• Already descaled and it didn't help. If you haven't descaled in the last week, do that first — it resolves the majority of "not heating" cases on every Breville model.
• Water reaches temperature on the display, but the cup is still cold or lukewarm. This points to a sensor reading wrong, not necessarily the element itself.
• Water never gets warm at all, no matter how long you wait, and the display shows an error or never leaves its startup state. This is the strongest signal of an actual element failure.
• Steam wand also fails to produce steam (on models with one) alongside no brew heat — suggests a shared boiler or power-supply fault rather than an element isolated to just the brew side.
• Machine trips a thermal protector or resets when you try to brew — check the specific reset procedure for your model before assuming the element itself needs replacing.

If any of the above point somewhere other than the element, the not-heating guide for your specific model — linked in each section below — covers those causes first.

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Tools You'll Need

• Phillips #1 and #2 screwdrivers
• Multimeter (to confirm element failure before you buy a part — a working element should show a specific resistance range, not infinite resistance)
• Needle-nose pliers
• Replacement element for your model (see cost by model below)
• Towels — internal water lines will drain when you disconnect fittings

Safety first: unplug the machine and let it sit at least 30 minutes before opening it. Boilers and thermoblocks hold heat and pressure longer than the outside of the machine suggests.

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Barista Express (BES870): Thermoblock Replacement

The Barista Express uses a single thermoblock for both brewing and steam. When it fails outright — not just scaled, actually failed — the whole block typically needs replacing rather than a single internal part.

1. Unplug and let the machine cool for at least 30 minutes
2. Remove the water tank and drip tray, then the rear panel screws
3. The thermoblock sits centrally, connected to the water inlet, the group head outlet, and the steam wand line — three water connections in total
4. Photograph the wiring and tubing before disconnecting anything
5. Disconnect the water lines at their push-fit connectors (press the collar, then pull), and disconnect the two electrical leads (heating coil and temperature sensor)
6. Remove the 2-3 mounting screws holding the block to the frame
7. Install the new thermoblock, water connections first, then electrical
8. Reassemble, then run 2-3 water-only cycles through the group head and steam wand before pulling a shot

Time: 60-90 minutes. Cost: $80-150 for the part; $150-250 if you have it professionally installed instead. Difficulty: Advanced.

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Barista Pro (BES878): ThermoJet Element Replacement

The BES878's ThermoJet is a flat-plate element rather than a thermoblock — it heats a thin layer of water almost instantly, which is what gives the Pro its fast warm-up, but it also means less water buffering against scale, so failures here often follow a period of neglected descaling.

1. Unplug and let cool 30 minutes minimum
2. Remove the water tank, drip tray, and side panels — the BES878 has more accessible side screws than the Express
3. The ThermoJet element is a flat, rectangular unit mounted near the group head, not a cylindrical block like the Express thermoblock
4. Disconnect the two water fittings and the electrical connector, photographing positions first
5. Remove the 2 mounting bolts and lift the element straight out — it sits in a channel rather than being deeply recessed
6. Install the new element in the same orientation, reconnect water fittings first, then electrical
7. Reassemble and run a manual purge cycle (hold the hot water button 5-10 seconds) before your first shot

Time: 45-60 minutes. Cost: $40-80 for the part. Difficulty: Advanced, though the BES878's more accessible layout makes this somewhat easier than the Express thermoblock swap.

For descaling steps that prevent this failure in the first place, see the BES878 descaling guide.

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Bambino Plus (BES500): ThermoJet Replacement

The Bambino Plus shares the same ThermoJet concept as the Barista Pro, but in a smaller housing with less room to work. This is the tightest of the four to access.

1. Unplug and let cool at least 30 minutes — the Bambino's compact housing holds heat close to the element
2. Remove the water tank and drip tray, then the base panel — most of the Bambino's screws are underneath, some under the rubber feet
3. The ThermoJet sits close to the pump, with short runs of tubing rather than the longer lines found on larger models
4. Disconnect tubing and the electrical connector, photographing positions first — the compact layout makes it easy to misplace a connector without a reference photo
5. Remove the single mounting bracket screw and lift the element out
6. Install the replacement, reconnect tubing fully onto the barbs, then electrical
7. Reassemble and run 2 water-only cycles before pulling a shot, checking both connections for leaks

Time: 40-55 minutes. Cost: $45-70 for the part. Difficulty: Advanced — mainly due to limited working space, not complexity.

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Dual Boiler (BES920): Boiler Element Diagnosis and Replacement

The Dual Boiler runs two fully independent boilers — one for shots, one for steam — each with its own heating element and PID controller. A failed element takes down only the boiler it belongs to; the other side keeps working normally, which is actually the easiest way to confirm which one has failed.

Diagnose which boiler first:

• Steam works, espresso is cold → shot boiler element has failed
• Espresso is fine, no steam → steam boiler element has failed
• Both cold → check the shared power supply before assuming both elements failed simultaneously, which is rare

Given the BES920's price point and the density of connections around its control board, this is the one model in this guide where professional service is often the more sensible choice rather than a DIY teardown — but here's what's involved if you're taking it on yourself:

1. Unplug and let cool at least 45 minutes — the Dual Boiler holds more residual heat than the single-boiler models
2. Remove top and side panels, both of which use 1-2 screws each
3. Identify the affected boiler from your diagnosis above, and photograph every connection before touching it — there are more wires here than on any other Breville model in this guide, including PID sensor leads that are easy to cross
4. Disconnect the boiler's water lines and electrical leads, then remove its 3-4 mounting bracket screws
5. Install the replacement boiler element, reconnect water lines first, then electrical, matching your photos exactly
6. Reassemble and run the boiler's factory-reset temperature check before your first shot (hold the 1-cup and 2-cup buttons together at power-on)

Time: 2-3 hours. Cost: $90-150 for the part, given the machine's higher-end components. Difficulty: Advanced — this is the one repair in this guide where hiring it out is a genuinely reasonable choice.

For the full maintenance schedule that helps prevent element failure on this model, see the Dual Boiler maintenance guide.

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When to Replace the Machine Instead

• Bambino Plus ($300-350 new): A $45-70 element repair is worth it if the machine is under 2 years old. Beyond that, weigh it against the low cost of a new unit.
• Barista Express ($600-700 new): Worth repairing at almost any age if it's otherwise in good shape — the $80-150 part cost is a small fraction of replacement.
• Barista Pro ($500-600 new): Same logic — the $40-80 element cost makes this an easy repair to justify.
• Dual Boiler ($1,700-2,000 new): Always worth repairing over replacing, even at the higher $90-150 part cost and longer repair time — professional service is a reasonable alternative here specifically.

If the machine is within Breville's warranty (1-2 years depending on model), contact Breville support before opening anything — they classify heating failures as manufacturing defects in many cases and will often cover it.

Breville Support: 1-866-273-8455 | breville.com/support

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Preventing Element Failures

• Descale on schedule for your model — every 3-4 months for the Express and Pro, more often in hard water areas, and every 60-90 days on the Dual Boiler given its two independent circuits
• Use filtered water. It's the single most effective thing you can do to extend element life across every model here
• Never let the water tank run dry mid-brew — this stresses the element and, on some models, blows a thermal protector before the element itself gives out
• Don't ignore a fluctuating PID reading on the Dual Boiler or a slow heat-up on any model — both are early warning signs that precede outright failure by weeks or months

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FAQ

How do I know if it's the element and not just scale?

Descale first, always — it's free and resolves most "not heating enough" complaints. If the machine still won't reach temperature after a full descale cycle and a rinse, the element is a much stronger suspect. A multimeter check on the disconnected element (looking for the expected resistance range rather than infinite resistance, which indicates an open circuit) confirms it before you buy a part.

Is this a beginner-friendly repair?

No. All four of these are advanced repairs involving full disassembly, water-line disconnection, and electrical connectors. If you've never opened a small appliance before, the Bambino Plus and Dual Boiler in particular are not good starting points — the Barista Pro's more accessible layout is the least difficult of the four, but "least difficult" here still means advanced.

My Barista Express heats for steam but not for espresso. Is that the element?

Not necessarily. The Express uses one thermoblock for both, so a total element failure would usually take out both functions together. A brew-only failure more often points to a stuck valve or a specific temperature sensor issue rather than the whole thermoblock — check the Barista Express not-heating guide for that specific pattern before ordering a full thermoblock.

Does replacing the element also fix bad-tasting or sour espresso?

Only if sour, under-extracted espresso was actually caused by low brew temperature. Run a thermometer check on the water coming through the group head after any repair — you're targeting 195-205°F. If temperature reads correctly but the espresso still tastes sour, look at grind size and dose instead.

Can I buy a universal replacement element instead of a Breville-specific one?

Not recommended. Breville's thermoblocks and ThermoJet elements are shaped and wired specifically for each model's water path and mounting points. A generic espresso machine heating element, even one with matching wattage, is very unlikely to fit or connect correctly.

Will this repair void my warranty?

Yes, if the machine is still within Breville's warranty period. Opening the machine yourself voids that coverage. Check your purchase date and contact Breville support first if there's any chance you're still covered — they may replace the unit or send a technician instead.