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Printed Circuit Board Enclosed - Electronic Control - Combi/Promax

Part number (MPN)
5121025
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Source
retailer parts list
checked 2026-11-06
Fitting notes

Work on gas appliances must be carried out by a Gas Safe registered engineer. Check the model and serial number on the boiler data plate. Source: a parts retailer's list, not the manufacturer's: confirm the part number on the data plate or with the manufacturer before ordering.

Compatible appliances

Always check the model and serial number on the data plate before ordering.

Frequently asked questions

Which appliances does 5121025 fit?

The sources we checked list 5121025 (Printed Circuit Board Enclosed - Electronic Control - Combi/Promax, Baxi) for: 12 ERP IE SERIAL AC, 12 ERP IE SERIAL BC, 15 ERP IE SERIAL AC, 15 ERP IE SERIAL BC, 18 ERP IE SERIAL AC, 18 ERP IE SERIAL BC, 24 ERP IE SERIAL AC, 24 ERP IE SERIAL BC, 30 ERP IE SERIAL AC, BAXI SOLO 24 HE SYS NG, Baxi Combi HE Plus 100, Baxi Combi HE Plus 133, Baxi Combi HE Plus 80, Baxi HE Plus 50/2, Baxi HE Plus 80/2, Baxi HE Plus Iss 02 100/2, MAIN HEAT ERP 24 V2 NG, PLATINUM 15 HE NG, PLATINUM 24 HE NG, PROMAX SL ERP HEAT 24 V2 NG, Baxi Solo HE 12, Baxi Solo HE 15, Baxi Solo HE 18, Baxi Solo HE 24, Baxi Solo HE 30, Baxi Solo HE A 12, Baxi Solo HE A 15, Baxi Solo HE A 18, Baxi Solo HE A 24, Baxi Solo HE A 30, SOLO HEAT IE ERP 12 NG, SOLO HEAT IE ERP 15 NG, SOLO HEAT IE ERP 18 NG, SOLO HEAT IE ERP 24 NG, SOLO HEAT IE ERP 30 NG, SOLO IE 12HE NG, SOLO IE 15HE NG, SOLO IE 18HE NG, SOLO IE 24HE NG, SOLO IE 30HE NG, Baxi System 100 HE Plus Iss, MAIN 12 HEAT ERP SERIAL AC, MAIN 12 HEAT ERP SERIAL BC, MAIN 15 HEAT ERP SERIAL AC, MAIN 15 HEAT ERP SERIAL BC, MAIN 18 HEAT ERP SERIAL AC, MAIN 18 HEAT ERP SERIAL BC, MAIN 24 HEAT ERP SERIAL BC, MAIN 30 HEAT ERP, MAIN HEAT ERP 24 V1 NG, Potterton Promax Sl Heat ErP 30, PROMAX SL ERP HEAT 24 V1 NG, PROMAX SL HEAT ERP 18 S/N AC, PROMAX SL HEAT ERP 24 S/N BC, PROMAX SL HEATERP12 (SER AC)NG, PROMAX SL HEATERP12(SER BC) NG, PROMAX SL HEATERP15(SER AC) NG, PROMAX SL HEATERP15(SER BC) NG, PROMAX SL HEATERP18 (SER BC)NG. Always check the model and serial number on the data plate before ordering.

Does 5121025 have equivalent or superseded part numbers?

The sources we checked list no equivalents for 5121025. Ask a Baxi stockist to confirm.

What should I check before fitting 5121025?

Work on gas appliances must be carried out by a Gas Safe registered engineer. Check the model and serial number on the boiler data plate. Source: a parts retailer's list, not the manufacturer's: confirm the part number on the data plate or with the manufacturer before ordering.

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Some lists are dated and the part may have been superseded. Information only, compatibility not guaranteed.