Before you start
About 30–45 minutes; allow longer for your first repair. Photograph the connections and part order as you go.
Work on a cool, unplugged machine
- Unplug the machine and allow it to cool completely before opening it.
- Keep the machine unplugged until the top cover, controls and every removed screw are refitted. Close the machine before any powered test.
- DIY repairs carry risk. Stop if you are unsure about any disassembly or reassembly step.
Tools and supplies
- Phillips screwdriver
- T20 Torx driver
- 13 mm and 14 mm spanners
- Adjustable spanner or vice
- 6 mm Allen key
- Small flat-blade screwdriver
- Pliers
- Wire brush for the ball valve
- Food-grade grease (optional)
Current seal-kit contents
| 3× |
Red connection O-rings |
| 2× |
White PTFE seat washers |
| 1× |
008 HNBR valve-key O-ring |
Check the supplied kit contents and replace each seal in its matching original location.
Watch the original repair
BrevTech · BES920 · 8:14
Fit the new kit washers and the correct 008 HNBR seal. Complete the refitting and closed-machine checks below before returning the machine to service.
Watch the repair video on YouTube. Use the timestamp links beside each step to watch the relevant operation. Follow the written instructions for the current kit and final checks.
Part 1 of 5
Two marked Phillips screw positions under the front panel of a Breville Dual Boiler. BrevTech photo guide
Two marked Torx screw positions at the rear of a Breville Dual Boiler. BrevTech photo guide Part 2 of 5
Gloved hand pulling the steam lever cover away from the front panel. BrevTech photo guide
06
Remove the actuator screw
Use a Phillips driver to remove the screw securing the steam dial actuator (SP0001712).
If this screw is rusted or seized, see the fallback note below.
Watch: Handle and actuator removal 1:27
Driver inserted into the screw at the steam dial actuator. BrevTech photo guide
Steam valve in the machine with bracket screws and release points numbered. BrevTech photo guide Part 3 of 5
13 mm spanner on the upper section of the removed steam valve. BrevTech photo guide
After removal: the lower threaded section and its existing white seat. Detail photo · 3:08
10
Open the middle section
Use a 6 mm Allen key to remove the middle section and expose the washer and ball valve.
Take care: The middle section can be tight.
Watch: Bench-disassembly overview 3:10
6 mm Allen key engaged in the middle section of the steam valve. BrevTech photo guide Inspect before fitting new seals
Four faults a seal kit cannot fix
With the valve apart, check the working surfaces and coupling. Renewing seals helps only when the valve hardware remains serviceable.
Inspect the ball for pitting or surface damage. Detail photo · 4:52Pitted or damaged ball
Scale may clean off with a wire brush. Pitting or damage to the ball needs replacement hardware; new seals alone will not repair that surface.
Watch: Inspect pitted or damaged ball 4:52
Inspect the ball key for wear. Detail photo · 4:59Worn ball key
Check the notch that engages the ball. If it is worn down and no longer engages properly, replace the damaged component.
Watch: Inspect worn ball key 4:59
Comparison of worn and intact valve-key openings. Detail photo · 5:13Rounded or enlarged key opening
Look for wear that has rounded the original oval/keyed opening. The oval/keyed shape is the intended form, not the defect.
Watch: Inspect rounded or enlarged key opening 5:13
Check the actuator coupling for corrosion. Detail photo · 5:34Damaged actuator coupling
Corrosion or wear in the internal steam-knob coupling can prevent correct valve operation. A seal-only service does not restore damaged coupling geometry.
Watch: Inspect damaged actuator coupling 5:34
If a component is pitted, badly worn or damaged, replace the affected component or valve assembly, or seek service. The seal-only kit is not a cure for damaged hardware.
Part 4 of 5
Small flat-blade tool lifting a washer from inside the steam-valve body. BrevTech photo guide
13
Fit the two new PTFE seat washers
Replace each removed white washer in its matching original recess: one seat belongs on each side of the ball. Use the Allen key to guide the recessed seat into position.
Fit the new washers supplied with the kit; replace the old washers instead of turning them over.
Watch: Existing seat position in the body 7:07
Seat-location references: existing washers in the main body and removed end section. These frames show where the seats belong, not new washers being installed. Detail photo · 7:07Seat-location references: existing washers in the main body and removed end section. These frames show where the seats belong, not new washers being installed. Detail photo · 3:08
14
Fit the correct 008 HNBR O-ring
Remove the old valve-key O-ring and fit the specified 008 HNBR replacement from the kit. Keep sharp tools away from the new ring.
Fit the specified 008 HNBR seal to the moving valve key. Do not substitute a red/orange silicone ring.
Take care: Keep sharp tools away from the new O-ring so it is not nicked.
Watch: Why the 008 seal material matters 3:50
Hands stretching a green O-ring around the steam-valve key. BrevTech photo guide
Wire brush cleaning buildup from the small steam-valve ball. BrevTech photo guide
16
Refit the valve key
If using food-grade grease, apply a small amount as an optional assembly aid. Refit the valve key and pull it into place with pliers.
Align the key so its notch engages the groove in the ball; match the original orientation recorded during disassembly.
17
Close the ball before seating the washers
Refit the ball in the CLOSED position, with its solid face outward as shown. Keep it closed while tightening the middle section so the new PTFE washers form around the ball correctly.
Take care: Tightening around the wrong ball position can permanently damage a new washer. Confirm the orientation before tightening.
Watch: Bench-reassembly overview 7:04
Ball inside the steam-valve body as the middle section with a white washer is brought into position. BrevTech photo guide
18
Finish the valve seals
Replace each red connection seal in its matching original location, then reassemble the valve sections completely. Match the seals to those removed from your valve.
Keep the ball closed while finishing the seat-forming step.
Place each red O-ring in its verified original position. The kit contains three; the quantity supplied does not establish an additional fitment location.
Watch: Bench-reassembly overview 7:04
Part 5 of 5
Refit and check
19
Refit the serviced valve
Fit the serviced steam valve back in its bracket and restore the connections removed for access.
Refit the actuator screw and steam lever cover before moving the lever.
Serviced steam valve mounted back in the machine. BrevTech photo guide
20
Test the steam lever
With the machine still unplugged, move the lever through a few cycles to bed in the new washers. It may feel stiff at first.
Refit the actuator screw and lever cover before cycling the lever. Keep the machine unplugged.
21
Close the machine and check normal operation
Refit the top cover and all front and rear screws. Only then reconnect power and check normal steaming with the machine closed. If dripping or an external leak continues, switch off, unplug and seek further diagnosis.
Perform this closed-machine check after refitting the valve to confirm the result of your repair.
Final checklist
- The ball is closed with its solid face outward; the valve sections and each original connection seal are reassembled in their matching positions.
- The valve is refitted and the bracket and clips removed for access are restored.
- The steam lever controls, top cover and all front and rear screws are fitted before restoring power.
- The lever turns through a few cycles to bed in the new washers, and the steam wand has been checked for continued dripping.
If dripping, an external leak, unusual movement or an electrical fault remains, switch off, unplug and seek further diagnosis.
If the repair gets complicated
The actuator screw is seized or rusted
The existing guide describes a 5 mm drill-bit fallback to remove the head of a seized actuator screw, then removing the remaining thread with pliers. This is an advanced recovery step; seek technician help if you are unsure. The main procedure assumes the fastener can be removed normally.
The lever feels stiff after fitting new seats
With the machine unplugged and the actuator and lever cover refitted, move the lever through a few cycles to bed in the new washers. Recheck assembly if the movement is abnormal. Close the machine before any powered check.
Fresh seals have not stopped the leak
Revisit the ball, key, housing opening and actuator coupling checks. New seals cannot restore worn or damaged hardware. Replace the affected component or valve assembly, or seek service.
Return to the four hardware checks
