Main
Main Diaphragm Rep Kit (System) 5111141
Diaphragm repair kit 5111141 for Main System HE and Potterton Performa System HE boilers.
£0.01
£0.01 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 diaphragm repair kit (system) is a Main-branded spare with part number 5111141, listed in the diverter valve category for gas boilers. It is used to restore the diaphragm function within the diverter valve assembly on the System HE appliances listed below. The kit is the system variant, so it should be matched to the appliance model before ordering.
Signs this part needs replacing
- Domestic hot water runs cold or fails to reach temperature while the heating circuit continues to operate
- The boiler does not switch between central heating and hot water demand as it should
- Hot water performance is intermittent or inconsistent, particularly when a tap is opened and closed
- The diverter valve does not move through its full travel, or the diaphragm is found split, perished or distorted on inspection
- Water is present around the diverter valve housing where the diaphragm seals
Before you order
- Confirm the appliance model against the fit list above, as this kit is the system variant
- Check the part number 5111141 against the existing component or the appliance documentation
- Verify whether the full diverter valve assembly or only the diaphragm kit is required
- Isolate the electrical supply and the water and gas connections before any work on the appliance
Compliance
| GC number | 796-470 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| MAIN MAIN SYSTEM 18HE | 41-467-01 | 41-467-01 | — | — |
| MAIN MAIN SYSTEM 24HE | 41-467-02 | 41-467-02 | — | — |
| MAIN MAIN SYSTEM 28HE | 41-467-03 | 41-467-03 | — | — |
| POTTERTON PERFORMA SYSTEM 12HE | 41-591-24 | 41-591-24 | — | — |
| POTTERTON PERFORMA SYSTEM 18HE | 41-591-25 | 41-591-25 | — | — |
| POTTERTON PERFORMA SYSTEM 24HE | 41-591-26 | 41-591-26 | — | — |
| POTTERTON PERFORMA SYSTEM 28HE | 41-591-27 | 41-591-27 | — | — |
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.
MAIN appliance manual — MAIN SYSTEM 18HE (GC 41-467-01), MAIN SYSTEM 24HE (GC 41-467-02), MAIN SYSTEM 28HE (GC 41-467-03)
manualmanualPOTTERTON appliance manual — PERFORMA SYSTEM 12HE (GC 41-591-24), PERFORMA SYSTEM 18HE (GC 41-591-25), PERFORMA SYSTEM 24HE (GC 41-591-26), PERFORMA SYSTEM 28HE (GC 41-591-27)
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