Main
Main Printed Circuit Board 7679739
Printed circuit board (LMU 34) for Main System 28 Eco gas boilers, part number 7679739.
At a glance
- Also known as 1162101, N6418
Showing prices
£199.72
£166.43 ex. VAT · VAT at 20%
Available to order · 3 working days
Available to order · 3 working days
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 Main 7679739 is a printed circuit board (PCB) for Main System 28 Eco gas boilers, identified by the LMU 34 designation. It is the control board within the appliance.
Signs this part needs replacing
- The boiler fails to fire or does not respond to a call for heat
- No display, or a blank or erratic display, on the boiler control panel
- Repeated lockouts or fault codes that clear only temporarily
- Intermittent running, or the boiler cutting out mid-cycle
- No power to the boiler despite a confirmed electrical supply
Before you order
- Confirm the boiler model matches one of the listed Main System 28 Eco variants
- Check the GC number on the appliance data badge against the list above
- On ErP models, check the serial number suffix (DC versus AC, BC or CC) to identify the correct variant
- Compare the part number and board markings on the existing PCB with 7679739
Compliance
| Alternative numbers | 1162101, N6418 |
|---|
| Make | Model / assembly | Reference | Years | Fitment |
|---|---|---|---|---|
| MAIN MAIN 28ECO SYSTEM | — | — | — | |
| MAIN MAIN 28HE ECO ELITE SYSTEM | — | — | — | |
| MAIN MAIN ECO ELITE 28 SYSTEM ErP | — | — | — | |
| MAIN MAIN ECO ELITE SYSTEM 28 | 41-467-22 | 41-467-22 | — | — |
| MAIN MAIN ECO ELITE SYSTEM 28 ErP (SERIAL NO ENDING AC, BC OR CC) | 41-467-29 | 41-467-29 | — | — |
| MAIN MAIN ECO ELITE SYSTEM 28 ErP (SERIAL NO. ENDING DC) | 41-467-29 | 41-467-29 | — | — |
| MAIN MAIN SYSTEM ECO 28 | 41-467-12 | 41-467-12 | — | — |
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
MAIN appliance manual — MAIN ECO ELITE SYSTEM 28 (GC 41-467-22)
manualmanualMAIN appliance manual — MAIN ECO ELITE SYSTEM 28 ErP (SERIAL NO ENDING AC, BC OR CC) (GC 41-467-29), MAIN ECO ELITE SYSTEM 28 ErP (SERIAL NO. ENDING DC) (GC 41-467-29)
manualmanualMAIN appliance manual — MAIN SYSTEM ECO 28 (GC 41-467-12)
manualNo technical questions yet for this part.
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