Thorn
Thorn Limit Safety Thermostat 402A043
Thorn limit safety thermostat 402A043 for Apollo gas appliances, monitoring boiler temperature and cutting the burner at the set limit.
At a glance
- Part type: Thermostats & Thermistors
- Appliance family: Thorn Apollo
£28.80
£24.00 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 Thorn limit safety thermostat 402A043 is a temperature-sensing control used on Thorn gas appliances. It monitors the boiler temperature and interrupts the burner when the set limit is reached, so the appliance shuts down rather than overheating. The part belongs to the Thorn Apollo appliance family and is listed under the Thermostats & Thermistors category.
Signs this part needs replacing
- The boiler locks out or shuts down shortly after firing, with no obvious flame or ignition fault.
- The appliance runs hotter than the temperature set on the control, or the control has no effect on burner operation.
- The boiler will not restart until it has cooled, then repeats the same shutdown cycle.
- The thermostat requires repeated manual resets to keep the appliance running.
- Heat output stops altogether while the pump and other controls continue to run.
Before you order
- Check the GC number on the appliance data badge against the compatibility list to confirm the correct variant.
- Confirm the appliance model, for example Apollo 15/30, 30/50 or 40, before ordering.
- Note the position and wiring of the existing thermostat before removal so the replacement is fitted the same way.
Mechanical
| Part type | Thermostats & Thermistors |
|---|---|
| Appliance family | Thorn Apollo |
Compliance
| Manufacturer part number (MPN) | 402A043 |
|---|---|
| GC number | 382-396 |
| Barcode / EAN | 5039177631194 |
| Commodity code | 9032 10 00 00 |
| GPC classification | Household Boilers/Furnaces/Tank Water Heaters Replacement Parts/Accessories |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| THORN APOLLO 15/30B | 41-789-53 | 41-789-53 | — | — |
| THORN APOLLO 15/30C | 41-789-55 | 41-789-55 | — | — |
| THORN APOLLO 30/50B | 41-789-54 | 41-789-54 | — | — |
| THORN APOLLO 30/50C | 41-789-56 | 41-789-56 | — | — |
| THORN APOLLO 40B | 41-789-79 | 41-789-79 | — | — |
| THORN APOLLO 40C | 41-789-78 | 41-789-78 | — | — |
| THORN APOLLO FANFARE 15/30 | 41-789-71 | 41-789-71 | — | — |
| THORN APOLLO FANFARE 30/50 | 41-789-72 | 41-789-72 | — | — |
| THORN THORN APOLLO 15/30B (FROM SERIAL NO 8702406241) | — | — | — | |
| THORN THORN APOLLO 15/30B (UP TO SERIAL NO 8702406240) | — | — | — |
Showing 10 of 22 compatible appliances.
Documents & drawings
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