Verified boiler fault code
Sime ALL 96 Fault Code (Brava Slim HE ErP)
Lock caused by a blocked flue/smoke outlet.
Safety disclaimer
Fault code summary
- Manufacturer
- Sime
- Fault code
- ALL 96
- Fault type
- Flue, Safety lockout
- Severity
- high
- Reset
- The official table directs the flue and electrode checks to diagnosis; do not repeatedly reset a flue lockout.
- Applicable models
- Brava Slim HE ErP 25, Brava Slim HE ErP 30, Brava Slim HE ErP 35, Brava Slim HE ErP 40
Quick answer
Lock caused by a blocked flue/smoke outlet.
What does this fault code mean?
Lock caused by a blocked flue/smoke outlet.
Common causes
- Blocked chimney or smoke outlet
- Electrode position issue
Symptoms
- ALL 96 alarm displayed
- Boiler operation may lock
What can the homeowner safely check?
- Look only for an obvious external flue obstruction from ground level; do not dismantle or enter the flue.
Boiler reset information
The official table directs the flue and electrode checks to diagnosis; do not repeatedly reset a flue lockout.
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 inspect the chimney/smoke outlet and electrode position using 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 | 96 | Block due to clogging in smoke outlet | - Check for blockage in chimney - Check the smoke outlet and electrode position (not touching the burner) |
Last verified
2026-09-12
Frequently asked questions
What does Sime ALL 96 mean?
Lock caused by a blocked flue/smoke outlet.
Can I reset a Sime ALL 96 fault?
The official table directs the flue and electrode checks to diagnosis; do not repeatedly reset a flue lockout.