Brand New Breville Dual Boiler (BES920) - Persistent Airlock & Overheating Issues (Steam from Group Head)
Hi everyone,
I’m looking for some help with a brand new Breville Dual Boiler (purchased in NZ, moved to India). I am currently dealing with a persistent airlock/vapor lock issue that I can’t seem to clear. I’m using a standard water purifier (non-RO), so conductivity shouldn't be the issue. The kitchen is air-conditioned and cool.
The Problem:
• Overheating/Inaccurate Temp: The machine frequently jumps to 104°C or shows "instant" temperature changes (e.g., jumping from 87°C to 96°C in a second).
• Flow Issues: I get "puffing" steam from the group head and hot water dispenser instead of steady water. Sometimes I get a few drops, sometimes a "rain" for 20ml, then it stops.
• Pressure Gauge: The needle stays at zero, even with a cleaning disc in, though I do hear a "whoosh" of pressure releasing into the drip tray when I stop the pump.
• Button Logic: 1-cup and 2-cup buttons work occasionally, but the "Manual" button seems to be locked out or unresponsive during these events.
What I have tried so far:
Venting the Boilers: I have used the service screws (#1 and #2) behind the drip tray. I’ve seen heavy steam exit these screws. I’ve tried "burping" them by running the pump while the screws are cracked open until water exits.
Solenoid Cycling: I’ve tried the "back-pressure kick" by running the pump against a cleaning disc and stopping it to cycle the 3-way valve. This improved the flow temporarily.
Priming Tricks: I’ve tried the "Steam Wand Slingshot" (opening the wand and hitting the brew button) and holding the Manual button to force the pump.
Hardware Checks: I’ve removed the shower screen and dispersion plate to check for blockages. The water tank is firmly seated, and I've tried priming without the water filter.
Cooling Down: I am currently letting the machine sit OFF for several hours to allow trapped steam to condense and the NTC probes to dry out from potential internal condensation.