Baxi Duo Tec Diverter Valve Cartridge Replacement Part

The Baxi diverter Valve Cartridge 7656807 is a brand new replacement cartridge designed to restore smooth switching between central heating and domestic hot water inside compatible Baxi boilers. When the old cartridge becomes worn, sticky, or fails to seal correctly, you may notice common issues such as hot water going warm/cold, radiators heating up when a tap is running, heating not coming on, or temperature fluctuations during use. Replacing the cartridge helps the diverter valve move and seal properly again, improving comfort and supporting efficient boiler operation.

Compatibility :

• Duo Tec Combi ErP: 24, 28, 33, 40
• Platinum Combi HE A: 24, 28, 33, 40
• Combi ErP HE A: 24, 28, 33, 40
• Gold HE A Combi: 24, 28, 33
• Gold Combi ErP: 24, 28

Important fitting advice

We recommend that all parts are fitted by a fully qualified Gas Safe registered engineer. If you need help confirming the right part, contact us our team has 10+ years of boiler spares knowledge and friendly chat support to help you quickly.

Delivery

At Boiler Spares Hub, we dispatch orders within 1 working day (Monday-Friday). Orders placed outside working days will be dispatched on the next working day. For delivery options available for this product, please add it to your basket or check our delivery options page.

Returns

We accept 30-day returns. Returns must be in an unopened, sealed box. If we find the item has been used or installation was attempted, we may refuse the return.

Frequently Asked Questions (FAQ’s)

1. What are the common symptoms of a failing Baxi diverter valve cartridge (7656807)?
Heating and hot water don’t switch properly, hot water fluctuates, radiators warm up when a tap runs, or one side stops working.

2. Can a faulty diverter valve cartridge cause no heating but hot water still works (or vice-versa)?
Yes if the cartridge sticks or doesn’t seal, it may divert flow to only heating or only hot water.

3. What are the main problems customers face when the diverter valve cartridge is faulty?
No heating, unstable/tepid hot water, incorrect changeover, radiators warming during hot water use, and intermittent performance.

4. Will a new 7656807 cartridge improve hot water temperature stability?
In many cases yes when the issue is internal leaking or sticking in the diverter valve, a new cartridge helps stabilise flow and temperature.

5. How do I confirm compatibility before ordering 7656807?
Match 7656807 and check your boiler model + GC number + serial/issue (AC/BC/CC/DC)