Medium
9E on Viessmann Vitodens 200-W B2KA-30

The boiler's solar hot water circuit is not circulating fluid properly, so the solar panels may not be adding heat to your hot water, though your main heating and gas supply can usually carry on working.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

What the manual says

Manufacturer manual

No flow rate in collector circuit or flow rate too low, or temperature limiter has responded

From this model's manual
Verified against the Viessmann/Viessmann Vitodens 200 W B2ha B2ka 5772909 installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer
Search the official register →
Boiler cover options

Avoid the next call-out bill

A cover plan would handle faults like 9E: no call-out fees, no surprise bills.

Approved partner
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Get a quote →

Affiliate links. We may earn a commission at no extra cost to you.

Related fault codes

9FView →9DView →

All 83 fault codes on the Vitodens 200-W B2KA-30

Seeing a different code? Every code this model can display, in one place.

4C9A9b9C9F101819202830384044485051585990919293949899A3A7b0b1b5b7b8bAbbbCbdbEbFC1C2C3C4C5C6C7C8CdCFd6d7d8dAdbdCdddEdFE0E1E3E4E5E7E8EAEbECEdEEEFF0F1F2F3F8F9FAFCFdFEFF

Related guides you might find useful

No hot water but heating works

Almost always a stuck diverter valve on a combi.

Read →

Radiator not heating up

One cold radiator is usually a stuck valve pin or trapped air.

Read →

Boiler keeps losing pressure

Six most common causes of dropping pressure.

Read →