Verified boiler fault code
Sime ALL 83 Fault Code (Brava Slim HE ErP)
Irregular combustion (temporary error).
Safety disclaimer
Fault code summary
- Manufacturer
- Sime
- Fault code
- ALL 83
- Fault type
- Combustion, Flue, Gas supply
- Severity
- high
- Reset
- The table gives engineer checks; no unrestricted repeated reset is advised.
- Applicable models
- Brava Slim HE ErP 25, Brava Slim HE ErP 30, Brava Slim HE ErP 35, Brava Slim HE ErP 40
Quick answer
Irregular combustion (temporary error).
What does this fault code mean?
Irregular combustion (temporary error).
Common causes
- Flue blockage
- Air-diaphragm issue on applicable balanced-flue models
- Gas calibration issue
Symptoms
- ALL 83 alarm displayed
What can the homeowner safely check?
- Do not adjust gas or combustion settings; look only for an obvious external obstruction and arrange an engineer.
Boiler reset information
The table gives engineer checks; no unrestricted repeated reset is advised.
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 check the flue, air diaphragm where applicable and gas calibration.
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 | 83 | Irregular combustion (temporary error) | - Check for blockage in chimney - Check air diaphragm (for BF models) - Check gas calibration |
Last verified
2026-09-12
Frequently asked questions
What does Sime ALL 83 mean?
Irregular combustion (temporary error).
Can I reset a Sime ALL 83 fault?
The table gives engineer checks; no unrestricted repeated reset is advised.