Boiler, thermoblock and heater fault codes
10 codes across 4 brands, from Breville / Sage, Jura, GE, Samsung.
What these parts do
Boilers and thermoblocks heat the water, and ovens and dryers use heating elements. A thermal fuse or thermostat cuts power if something overheats.
How they fail
The heater was switched on and the temperature did not climb, or it climbed too far. A blown thermal fuse, a failed element, scale insulating the heater, or a board relay stuck on can all be behind it.
Safe checks first
- Unplug and let the machine cool. Never test a heater that is hot or powered.
- Warm the machine to room temperature and restart once.
- Descale if due. Heavy scale slows heating enough to trip the check on some firmware.
- A heater that will not switch off is a safety issue. Do not leave the machine powered unattended.
Appliances carry mains voltage. Unplug before opening anything, and stop where a code's own page tells you to.
Every code, easiest fix first
| Code | Machine | Part at fault | DIY | Severity |
|---|---|---|---|---|
C6 | GE dishwasher | heating element, thermostat and hot-water supply | moderate | medium |
E4 | GE dryer | thermal fuse / high-limit thermostat | moderate | medium |
E-08 | Samsung range and wall oven | bake element, broil element, oven sensor | moderate | medium |
ER27 | Breville / Sage Oracle Touch | group head heater | hard | high |
12 | Breville / Sage Dual Boiler | group head heater | hard | high |
Error 5 | Jura | thermal fuse cords / thermoblock | hard | high |
Error 9 | Jura | thermoblock heating circuit / logic board relay | hard | high |
ER19 | Breville / Sage Oracle Touch | group head heater | not recommended | high |
Error 19 | Breville / Sage Oracle | group head heater | not recommended | high |
E7 | Breville / Sage Oracle Jet | group head heater | not recommended | high |
By brand
Breville / Sage: ER19, ER27, Error 19, E7, 12
Questions
How many codes involve boilers and heaters?
We cover 10 codes on boilers and heaters across 4 brands (Breville / Sage, Jura, GE, Samsung).
Can I fix these myself?
By our ratings, 0 are easy, 3 moderate and 7 hard. The cheap checks above clear a share of the easy and moderate ones; the hard ones usually need a part replaced.
Are any of these dangerous?
7 of the 10 are rated high severity, mostly where a heater or mains-powered part is involved. Stop using the machine and follow the stop advice on the code's page.