Ferroli
Ferroli LS1 Thermostat 541666
Ferroli LS1 limit thermostat, part 541666, for Pegasus F2 and F3 series commercial boilers.
At a glance
- Part type: limit thermostat
£56.54
£47.12 ex. VAT · VAT at 20%
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The LS1 thermostat (part 541666) is a limit thermostat supplied by Ferroli for its Pegasus range of commercial boilers. It is listed against the F2 and F3 appliance families, including the F2T, F2E and F2N variants. The thermostat monitors temperature at the flue gas side of the appliance and interrupts the burner circuit when the limit is exceeded.
Signs this part needs replacing
- The boiler locks out repeatedly and the limit thermostat is open circuit when tested
- Continuity across the thermostat is absent at ambient temperature
- The appliance cuts out before reaching its normal operating temperature
- The thermostat shows signs of heat damage or a disturbed capillary/body
- Fault-finding points to the flue gas limit circuit rather than the main control thermostat
Before you order
- Confirm the boiler model and serial/GC data against the fitment list
- Check the existing thermostat part number on the component itself
- Verify the fault lies with the limit thermostat and not a blocked flue or circulation issue
- Cross-check against the alternative part number FER39816110 before ordering
Compliance
| Alternative numbers | FER39816110 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| FERROLI FERROLI PEGASUS F2 WN | — | — | — | |
| FERROLI FERROLI PEGASUS F2N | — | — | — | |
| FERROLI FERROLI PEGASUS F3N | — | — | — | |
| FERROLI COMMERCIAL PEGASUS F2 MOD 102 - 30R0242/1 (01/07/1999) | — | — | — | |
| FERROLI COMMERCIAL PEGASUS F2 MOD 51 - 30R0242/1 (01/07/1999) | — | — | — | |
| FERROLI COMMERCIAL PEGASUS F2 MOD 68 - 30R0242/1 (01/07/1999) | — | — | — | |
| FERROLI COMMERCIAL PEGASUS F2 MOD 85 - 30R0242/1 (01/07/1999) | — | — | — | |
| FERROLI COMMERCIAL PEGASUS F2 N MOD 102 2S - 30K0384000 (01/03/2007) | — | — | — | |
| FERROLI COMMERCIAL PEGASUS F2 N MOD 102 2S - 30R0599/0 (01/04/2002) | — | — | — | |
| FERROLI COMMERCIAL PEGASUS F2 N MOD 51 2S - 30K0384000 (01/03/2007) | — | — | — |
Showing 10 of 19 compatible appliances.
Documents & drawings
Everything we hold for this part. Where a document exists but we don't hold it, the technical team will source it from the manufacturer — usually the same working day.
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