Low
d.50 on Vaillant Turbomax Plus

Your boiler is simply displaying the current temperature of the water flowing through your heating pipes, rather than indicating a breakdown.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

What the manual says

Manufacturer manual

Maximum flow temperature °C

From this model's manual
Verified against the Vaillant Turbomax Plus installation & service manual, page 39.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Press the 'i' button on your boiler display to toggle back to the standard operating viewCheck your thermostat settings to ensure the heating is set to your preferred temperatureMonitor the boiler for any actual error codes appearing in the future

Find a Gas Safe engineer
Search the official register →

Avoid the next call-out bill

A cover plan would handle faults like d.50: 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

Related guides you might find useful