Ideal
Ideal Limit Thermostat LM7P8508 171950
Ideal limit thermostat 171950 (LM7P8508) for British and Scottish Gas, Classic, Henrad and Optia boilers, cutting the burner at the set maximum temperature.
At a glance
- Part type: Limit thermostat (LM7P8508 limit stat)
- Also known as 1178351
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Showing prices
£60.64
£50.53 ex. VAT · VAT at 20%
Available to order · 1 working day
Available to order · 1 working day
Not certain it's the right part? The technical team verifies fitment before dispatch — no charge, and it stops a second trip.Call the technical teamSend a technical question
Same-day dispatch
Ordered by 4pm Mon–Fri, 10:30am Sat.
30-day returns
Unused, in original packaging.
What it is
The Ideal limit thermostat, part number 171950, is a temperature sensor and switch assembly used across the Ideal British and Scottish Gas, Classic, Henrad and Optia boiler ranges. Built-in sensors monitor boiler temperature continuously, and the switch stops the appliance operating once the selected maximum temperature is reached. It is supplied as an LM7P8508 limit stat and works as an overheat safeguard rather than a user-facing room or cylinder control.
Signs this part needs replacing
- The boiler locks out or shows a fault shortly after firing
- Repeated overheat trips that need a manual reset
- Heating or hot water cuts out well before the set temperature is reached
- The burner continues to run past the limit temperature
- Intermittent operation as the thermostat ages and the switch drifts
Before you order
- Check the GC number on the appliance data badge against the compatibility list before ordering.
- Earlier numbers 1178351 and 113200 identify the same thermostat.
- This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
Mechanical
| Part type | LM7P8508 Limit Stat |
|---|
Compliance
| Manufacturer part number (MPN) | 171950 |
|---|---|
| GC number | E58-720 |
| Barcode / EAN | 5022141719509 |
| Commodity code | 9032 10 00 00 |
| GPC classification | Household Boilers/Furnaces/Tank Water Heaters Replacement Parts/Accessories |
| Alternative numbers | 113200, 1178351 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| IDEAL BRITISH/SCOTTISH GAS 100 RD1 | 41-387-52 | 41-387-52 | — | — |
| IDEAL BRITISH/SCOTTISH GAS 30 RD1 | 41-349-72 | 41-349-72 | — | — |
| IDEAL BRITISH/SCOTTISH GAS 40 RD1 | 41-349-73 | 41-349-73 | — | — |
| IDEAL BRITISH/SCOTTISH GAS 50 RD1 | 41-349-74 | 41-349-74 | — | — |
| IDEAL BRITISH/SCOTTISH GAS 60 RD1 | 41-349-75 | 41-349-75 | — | — |
| IDEAL BRITISH/SCOTTISH GAS 70 RD1 | 41-349-76 | 41-349-76 | — | — |
| IDEAL BRITISH/SCOTTISH GAS 80 RD1 | 41-349-77 | 41-349-77 | — | — |
| IDEAL BRITISH/SCOTTISH GAS RD 109 | 41-397-56 | 41-397-56 | — | — |
| IDEAL BRITISH/SCOTTISH GAS RD 109 (SILVER) | 41-397-75 | 41-397-75 | — | — |
| IDEAL BRITISH/SCOTTISH GAS RD 112 | 41-397-57 | 41-397-57 | — | — |
Showing 10 of 267 compatible appliances.
Fitment listings are a guide, not a guarantee. Plant-room assemblies get modified on site more often than not. Send us the GC number off the data badge and a photo of the existing valve and we will confirm before anything is dispatched.
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.
manual
IDEAL appliance manual — BRITISH/SCOTTISH GAS 100 RD1 (GC 41-387-52), BRITISH/SCOTTISH GAS 30 RD1 (GC 41-349-72), BRITISH/SCOTTISH GAS 40 RD1 (GC 41-349-73), BRITISH/SCOTTISH GAS 50 RD1 (GC 41-349-74), BRITISH/SCOTTISH GAS 60 RD1 (GC 41-349-75), BRITISH/SCOTTISH GAS 70 RD1 (GC 41-349-76), BRITISH/SCOTTISH GAS 80 RD1 (GC 41-349-77)
manualmanualIDEAL appliance manual — BRITISH/SCOTTISH GAS RD 109 (GC 41-397-56), BRITISH/SCOTTISH GAS RD 109 (SILVER) (GC 41-397-75), BRITISH/SCOTTISH GAS RD 112 (GC 41-397-57), BRITISH/SCOTTISH GAS RD 112 (SILVER) (GC 41-397-76), BRITISH/SCOTTISH GAS RD 115 (GC 41-397-58), BRITISH/SCOTTISH GAS RD 115 (SILVER) (GC 41-397-77), BRITISH/SCOTTISH GAS RD 118 (GC 41-397-59), BRITISH/SCOTTISH GAS RD 118 (SILVER) (GC 41-397-78), BRITISH/SCOTTISH GAS RD 121 (GC 41-397-60), BRITISH/SCOTTISH GAS RD 121 (SILVER) (GC 41-397-79), BRITISH/SCOTTISH GAS RD 124 (GC 41-397-61), BRITISH/SCOTTISH GAS RD 124 (SILVER) (GC 41-397-80), BRITISH/SCOTTISH GAS RD 130 (GC 41-397-62), BRITISH/SCOTTISH GAS RD 130 (SILVER) (GC 41-397-81)
manualmanualIDEAL appliance manual — BRITISH/SCOTTISH GAS RD1 3100 (GC 41-392-25), BRITISH/SCOTTISH GAS RD1 330 (GC 41-392-13), BRITISH/SCOTTISH GAS RD1 340 (GC 41-392-16), BRITISH/SCOTTISH GAS RD1 350 (GC 41-392-17), BRITISH/SCOTTISH GAS RD1 360 (GC 41-392-20), BRITISH/SCOTTISH GAS RD1 370 (GC 41-392-21), BRITISH/SCOTTISH GAS RD1 380 (GC 41-392-24)
manualmanualIDEAL appliance manual — CLASSIC FF 2 100 (GC 41-349-71), CLASSIC FF LX 230 (GC 41-387-24), CLASSIC FF LX 240 (GC 41-387-25), CLASSIC FF LX 250 (GC 41-387-26), CLASSIC FF LX 260 (GC 41-387-27), CLASSIC FF LX 270 (GC 41-387-28), CLASSIC FF LX 280 (GC 41-387-29)
manualmanualIDEAL appliance manual — CLASSIC FF 250P (GC 41-387-07), CLASSIC FF 260P (GC 41-387-08), CLASSIC FF 275P (GC 41-387-09), CLASSIC FF LX 250P (GC 41-387-30), CLASSIC FF LX 260P (GC 41-387-31), CLASSIC FF LX 275P (GC 41-387-32)
manualmanualIDEAL appliance manual — CLASSIC FF230 (GC 41-387-02), CLASSIC FF240 (GC 41-387-03), CLASSIC FF250 (GC 41-387-04), CLASSIC FF260 (GC 41-387-05), CLASSIC FF280 (GC 41-387-06), CLASSIC NF LX 230 (GC 41-387-24), CLASSIC NF LX 240 (GC 41-387-25), CLASSIC NF LX 250 (GC 41-387-26), CLASSIC NF LX 260 (GC 41-387-27), CLASSIC NF LX 270 (GC 41-387-28), CLASSIC NF LX 280 (GC 41-387-29), CLASSIC NF230 (GC 41-387-01), CLASSIC NF240 (GC 41-387-02), CLASSIC NF250 (GC 41-387-03), CLASSIC NF260 (GC 41-387-04), CLASSIC NF270 (GC 41-387-05), CLASSIC NF280 (GC 41-387-06)
manualmanualIDEAL appliance manual — CLASSIC FF3100 (GC 41-392-01), CLASSIC FF330 (GC 41-391-54), CLASSIC FF340 (GC 41-391-95), CLASSIC FF350 (GC 41-391-96), CLASSIC FF360 (GC 41-391-97), CLASSIC FF370 (GC 41-391-98), CLASSIC FF380 (GC 41-391-99)
manualmanualIDEAL appliance manual — CLASSIC FF330 SLIMLINE (GC 41-392-02), CLASSIC FF340 SLIMLINE (GC 41-392-03), CLASSIC FF350 SLIMLINE (GC 41-392-04), CLASSIC FF360 SLIMLINE (GC 41-392-05)
manualmanualIDEAL appliance manual — CLASSIC FF340LF (GC 41-392-90), CLASSIC FF350LF (GC 41-392-91), CLASSIC FF360LF (GC 41-392-92)
manualmanualIDEAL appliance manual — CLASSIC FF350 P (GC 41-392-06), CLASSIC FF360 P (GC 41-392-07), CLASSIC FF380 P (GC 41-392-08)
manualmanualIDEAL appliance manual — CLASSIC HE 12 (GC 41-415-59), CLASSIC HE 15 (GC 41-421-45), CLASSIC HE 15P (GC 41-421-97), CLASSIC HE 18 (GC 41-421-46), CLASSIC HE 18P (GC 41-421-98), CLASSIC HE 9 (GC 41-415-58)
manualmanualIDEAL appliance manual — CLASSIC NF 30 (GC 41-429-30), CLASSIC NF 40 (GC 41-429-31), CLASSIC NF 50 (GC 41-429-32), CLASSIC NF 60 (GC 41-429-33), CLASSIC NF 70 (GC 41-429-77), CLASSIC NF 80 (GC 41-429-34)
manualmanualIDEAL appliance manual — CLASSIC NFP 50, CLASSIC NFP 60, CLASSIC NFP 80
manualmanualIDEAL appliance manual — CLASSIC RS330 (GC 41-392-09), CLASSIC RS340 (GC 41-392-10), CLASSIC RS350 (GC 41-392-11), CLASSIC RS360 (GC 41-392-12)
manualmanualIDEAL appliance manual — CLASSIC SE 12 FF (GC 41-395-31), CLASSIC SE 12 FF (SILVER) (GC 41-397-64), CLASSIC SE 15 FF (GC 41-395-32), CLASSIC SE 15 FF (SILVER) (GC 41-397-65), CLASSIC SE 18 FF (GC 41-395-33), CLASSIC SE 18 FF (SILVER) (GC 41-397-68), CLASSIC SE 18 FF SLIMLINE (GC 41-395-43), CLASSIC SE 21 FF (GC 41-395-34), CLASSIC SE 21 FF (SILVER) (GC 41-397-69), CLASSIC SE 24 FF (GC 41-395-35), CLASSIC SE 24 FF (SILVER) (GC 41-397-70), CLASSIC SE 30 FF (GC 41-395-36), CLASSIC SE 30 FF (SILVER) (GC 41-397-71), CLASSIC SE 9 FF (GC 41-395-30), CLASSIC SE 9 FF (SILVER) (GC 41-397-63)
manualmanualIDEAL appliance manual — CLASSIC SE 12 FF SLIMLINE (GC 41-395-41), CLASSIC SE 15 FF SLIMLINE (GC 41-395-42), CLASSIC SE 9 FF SLIMLINE (GC 41-395-40)
manualmanualIDEAL appliance manual — CLASSIC SE 12 RS (GC 41-395-45), CLASSIC SE 15 RS (GC 41-395-46), CLASSIC SE 18 RS (GC 41-395-99), CLASSIC SE 9 RS (GC 41-395-44)
manualmanualIDEAL appliance manual — CLASSIC SE 15P FF (GC 41-397-72), CLASSIC SE 18P FF (GC 41-397-73), CLASSIC SE 24P FF (GC 41-397-74)
manualmanualIDEAL appliance manual — CLASSIC SLIMLINE FF230 (GC 41-387-74), CLASSIC SLIMLINE FF240 (GC 41-387-75), CLASSIC SLIMLINE FF250 (GC 41-387-76), CLASSIC SLIMLINE FF260 (GC 41-387-77)
manualmanualIDEAL appliance manual — HENRAD WH FF LX30 (GC 41-349-94), HENRAD WH FF LX40 (GC 41-349-95), HENRAD WH FF LX50 (GC 41-349-96), HENRAD WH FF LX60 (GC 41-349-97), HENRAD WH FF LX70 (GC 41-349-98), HENRAD WH FF LX80 (GC 41-349-99), HENRAD WH FF100 (GC 41-349-93)
manualmanualIDEAL appliance manual — HENRAD WH FF30 (GC 41-349-87), HENRAD WH FF40 (GC 41-349-88), HENRAD WH FF50 (GC 41-349-89), HENRAD WH FF60 (GC 41-349-90), HENRAD WH FF70 (GC 41-349-91), HENRAD WH FF80 (GC 41-349-92)
manualmanualIDEAL appliance manual — OPTIA FF100 (GC 41-392-01), OPTIA FF30 (GC 41-391-54), OPTIA FF40 (GC 41-391-95), OPTIA FF50 (GC 41-391-96), OPTIA FF60 (GC 41-391-97), OPTIA FF70 (GC 41-391-98), OPTIA FF80 (GC 41-391-99)
manualmanualIDEAL appliance manual — OPTIA HE 12 (GC 41-421-71), OPTIA HE 15 (GC 41-421-72), OPTIA HE 18 (GC 41-421-96), OPTIA HE 9 (GC 41-421-70)
manualNo technical questions yet for this part.
Not sure which part?
Search by part number, product name or brand — our technical team confirms fitment before anything is dispatched.