Verified boiler fault code
Sime ALL 74 Fault Code (Brava Slim HE ErP)
Second delivery sensor fault.
Safety disclaimer
Fault code summary
- Manufacturer
- Sime
- Fault code
- ALL 74
- Fault type
- Temperature sensor, Central heating
- Severity
- high
- Reset
- The official table directs technical diagnosis and calibration; no user 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
Second delivery sensor fault.
What does this fault code mean?
Second delivery sensor fault.
Common causes
- Second delivery sensor fault
Symptoms
- ALL 74 alarm displayed
What can the homeowner safely check?
- Record the alarm and arrange qualified service; do not access the sensor or PCB.
Boiler reset information
The official table directs technical diagnosis and calibration; no user 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 check both delivery sensors, their positioning and wiring, and the associated control components.
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 | 74 | Second delivery sensor |
Last verified
2026-09-12
Frequently asked questions
What does Sime ALL 74 mean?
Second delivery sensor fault.
Can I reset a Sime ALL 74 fault?
The official table directs technical diagnosis and calibration; no user reset is confirmed.