Main
Main Wiring Harness HV DC Assembly 5112337
HV DC wiring harness assembly, part 5112337, for Main Heating Only HE and Potterton Performa and Suprima boilers.
At a glance
- Also known as 1123766
£71.80
£59.83 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 HV DC wiring harness assembly is a Main-manufactured electrical loom, part number 5112337. It carries high-voltage DC connections within the boiler's control and ignition circuit. It is used across Main Heating Only HE and Potterton Performa and Suprima appliance families.
Signs this part needs replacing
- Boiler fails to fire or cuts out intermittently with no other obvious cause
- Repeated ignition or flame-detection faults traced to the harness circuit
- Visible damage to the loom: cracked, brittle or chafed insulation
- Loose, corroded or heat-damaged connector terminals
- Scorch marks or discolouration along the harness or at its plugs
Before you order
- Confirm your appliance model against the fit list above before ordering
- Check the part number on the existing harness or boiler data plate
- Inspect the connector type and pin arrangement on the fitted harness
- Isolate the electrical supply before removing or refitting any wiring
Compliance
| GC number | H26-835 |
|---|---|
| Barcode / EAN | 5039177655923 |
| Alternative numbers | 1123766 |
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| MAIN MAIN HEATING ONLY 12 HE | 41-474-02 | 41-474-02 | — | — |
| MAIN MAIN HEATING ONLY 15 HE | 41-474-03 | 41-474-03 | — | — |
| MAIN MAIN HEATING ONLY 18 HE | 41-474-04 | 41-474-04 | — | — |
| MAIN MAIN HEATING ONLY 24 HE | 41-474-05 | 41-474-05 | — | — |
| MAIN MAIN HEATING ONLY 9 HE | 41-474-01 | 41-474-01 | — | — |
| POTTERTON PERFORMA HE 18 SL | 41-592-08 | 41-592-08 | — | — |
| POTTERTON PERFORMA HE 21 SL | 41-592-09 | 41-592-09 | — | — |
| POTTERTON PERFORMA HE 24 SL | 41-592-10 | 41-592-10 | — | — |
| POTTERTON SUPRIMA 30 HE | 41-075-35 | 41-075-35 | — | — |
| POTTERTON SUPRIMA 40 HE | 41-075-36 | 41-075-36 | — | — |
Showing 10 of 15 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.
MAIN appliance manual — MAIN HEATING ONLY 12 HE (GC 41-474-02), MAIN HEATING ONLY 15 HE (GC 41-474-03), MAIN HEATING ONLY 18 HE (GC 41-474-04), MAIN HEATING ONLY 24 HE (GC 41-474-05), MAIN HEATING ONLY 9 HE (GC 41-474-01)
manualmanualPOTTERTON appliance manual — PERFORMA HE 18 SL (GC 41-592-08), PERFORMA HE 21 SL (GC 41-592-09), PERFORMA HE 24 SL (GC 41-592-10)
manualmanualPOTTERTON appliance manual — SUPRIMA 30 HE (GC 41-075-35), SUPRIMA 40 HE (GC 41-075-36), SUPRIMA 50 HE (GC 41-075-37), SUPRIMA 60 HE (GC 41-075-38), SUPRIMA 70 HE (GC 41-075-39), SUPRIMA 80 HE (GC 41-075-40)
manualmanualPOTTERTON appliance manual — SUPRIMA 70 L (GC 41-590-46)
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