Most of the time this isn't a fault — it's the G30's built-in safety feature doing exactly what it's designed to do. The reset process differs depending on your version, so check which one you have below.
Why this happens
The G30 has a boil-dry protection system (a safety cut-out) built in. If the water level in the boiler gets too low, this system automatically switches off the heating element to protect the unit.
From the outside, this looks exactly like the element simply not working — but it's usually a quick fix, once you know which version you're working with.
How to reset the safety cut-out
Original G30 & G30v2 — manual reset button
These versions use a manual reset button on the underside of the boiler.
- Switch off and unplug your unit.
- Empty out any liquid remaining in the boiler.
- Locate the reset button on the underside of the boiler and press it firmly.
G30v3 — automatic thermal reset switch
The G30v3 is fitted with an automatic thermal reset switch — it resets itself once the base has cooled, with no button to press.
- Switch off and unplug your G30v3.
- Empty out any liquid remaining in the boiler.
- Let the base cool down fully. The switch will reset itself automatically once it's cooled — no need to press anything.
The other common cause: residue on the base
Regardless of which version you have, if your G30 keeps cutting out even after resetting, check the base for stuck-on proteins or nutrients from previous brews. Any residue left on the element can create hot spots, which will trip the cut-out again and again until it's properly cleaned off.
To fix it: give the base a thorough scrub, making sure there's nothing stuck to the element or the boiler floor, then try again.
Preventing it next time
A little routine care during your brew day goes a long way, on any version:
- At the start of the boil, some proteins and nutrients naturally collect on the base — lightly scrape the element with your brewing paddle to disperse them.
- Repeat this every now and then throughout the boil to stop build-up before it becomes a problem.
Still not heating?
If you've reset the cut-out (manually or via auto-reset) and thoroughly cleaned the base, and your G30 is still not heating, get in touch with the Grainfather Customer Services Team — our team can investigate further and help get you back to brewing.
A note if you're sent a replacement switch: if Customer Services organises a replacement reset switch for an Original G30 or G30v2, the part sent will likely be the newer automatic version rather than an exact match for your original manual switch. This replacement no longer has the plastic rod that the manual version uses. This is expected — it's simply the current part design — but it's worth knowing so it doesn't look unfamiliar when it arrives.