ALL 28 error code
ALL 28 — Maximum consecutive resets reached
What does Sime Brava Slim HE ErP condensing boiler ALL 28 mean?
Sime documents ALL 28 for the Brava Slim HE ErP range as “Maximum consecutive resets reached”. The alarm identifies the condition detected by the boiler controls; it does not by itself prove which component has failed.
The code identifies the condition detected by the product; it does not always identify the failed component on its own. Confirm the full code and exact model before ordering parts or attempting a reset.
The Sime Brava Slim HE ErP condensing boiler ALL 28 error code indicates sime documents ALL 28 for the Brava Slim HE ErP range as “Maximum consecutive resets reached”. The alarm identifies the condition detected by the boiler controls; it does not by itself prove which component has failed. This guide explains what the code means, the symptoms and likely causes, the checks that are safe to make, and when to stop and arrange an authorised repair.
Symptoms you may notice
The boiler displays alarm maximum consecutive resets reached and may suspend normal operation.
Common causes
The condition can arise from the component, wiring, configuration or operating circumstance identified by the alarm description.
Before you start troubleshooting
Use the display, rating label or product menu to confirm the exact model. Similar-looking codes can have different meanings across product generations and regions.
- Record the complete code before switching the equipment off.
- Check only user-accessible controls, filters and external connections described in the manual.
- Do not open gas, refrigerant, combustion or electrical compartments.
Troubleshooting steps
Record the exact code and operating conditions. Follow the official Sime diagnostic sequence and arrange qualified testing where internal access is required.
Can you fix this error code yourself?
This fault is not intended for user repair. Do not remove covers or test internal components; record the code and contact an authorised technician.
A successful reset is not proof that the underlying issue is fixed. If ALL 28 reappears, note when it happens and give that information to the service engineer.
Reset instructions
Reset only when the official instructions permit it and only after the cause has been corrected. Do not make repeated reset attempts; isolate the boiler and contact qualified personnel if the alarm returns.
Applicable products and models
Brava Slim HE ErP condensing boilerBrava Slim HE 24; 25; 30; 35; 40 ErPSupported rangeWhen to contact a professional
Contact a qualified Sime heating engineer if ALL 28 returns, prevents operation, involves combustion or a safety device, or requires internal checks.
Frequently asked questions
What does Sime Brava Slim HE ErP condensing boiler ALL 28 mean?
Sime documents ALL 28 for the Brava Slim HE ErP range as “Maximum consecutive resets reached”. The alarm identifies the condition detected by the boiler controls; it does not by itself prove which component has failed.
Can I fix Sime Brava Slim HE ErP condensing boiler ALL 28 myself?
This code is not classed as user-fixable. Record it and arrange authorised diagnosis rather than opening the product.
Should I reset the product after code ALL 28?
Reset only when the official instructions permit it and only after the cause has been corrected. Do not make repeated reset attempts; isolate the boiler and contact qualified personnel if the alarm returns.
When should I arrange a repair?
Contact a qualified Sime heating engineer if ALL 28 returns, prevents operation, involves combustion or a safety device, or requires internal checks.