Verified boiler fault code
Sime ALL 88 Fault Code (Brava Slim HE ErP)
Internal error (board component protection).
Safety disclaimer
Fault code summary
- Manufacturer
- Sime
- Fault code
- ALL 88
- Fault type
- PCB/electronics, Safety lockout
- Severity
- high
- Reset
- The official table says to check the board and replace it where necessary; no homeowner reset is confirmed.
- Applicable models
- Brava Slim HE ErP 25, Brava Slim HE ErP 30, Brava Slim HE ErP 35, Brava Slim HE ErP 40
Quick answer
Internal error (board component protection).
What does this fault code mean?
Internal error (board component protection).
Common causes
- Control-board component protection/internal error
Symptoms
- ALL 88 alarm displayed
What can the homeowner safely check?
- Record the alarm and isolate the appliance only using the normal user controls if the manual directs; do not open the casing.
Boiler reset information
The official table says to check the board and replace it where necessary; no homeowner reset is confirmed.
When should I call an engineer?
Contact a suitably qualified heating engineer when the fault persists, the boiler locks out, or the manufacturer instructions do not resolve it. For gas appliance work in the UK, use a Gas Safe registered engineer.
Engineer diagnosis
- A qualified engineer should assess the control board and related wiring, with replacement only under the manufacturer procedure.
Applicable boiler models
Related fault codes
- ALL 01 — Brava Slim HE ErP
Flue-gas thermostat fault.
Read fault code - ALL 02 — Brava Slim HE ErP
Low water pressure in the appliance.
Read fault code - ALL 03 — Brava Slim HE ErP
High water pressure in the heating circuit.
Read fault code - ALL 44 — Brava Slim HE ErP
No-flame gas-valve opening-time sum anomaly.
Read fault code - ALL 56 — Brava Slim HE ErP
Lock for delivery/return temperature difference above the maximum limit.
Read fault code - ALL 57 — Brava Slim HE ErP
Lock for the flow-temperature check (open-vent model).
Read fault code - ALL 62 — Brava Slim HE ErP
Self-calibration procedure required.
Read fault code - ALL 72 — Brava Slim HE ErP
Incorrect positioning of the delivery sensor.
Read fault code
Manufacturer documentation
Brava Slim HE ErP installation, use and maintenance manual (official Sime document 6322841C)Official manual fault table: | ALL | 88 | Internal error (board component protection) |
Last verified
2026-09-12
Frequently asked questions
What does Sime ALL 88 mean?
Internal error (board component protection).
Can I reset a Sime ALL 88 fault?
The official table says to check the board and replace it where necessary; no homeowner reset is confirmed.