What does the Vaillant P.3 fault code mean?

Your boiler has detected that the water temperature is rising far too quickly, which usually points to a temporary blockage or poor water flow through the system.

How much does it cost to fix Vaillant error code P.3?

Typical repair cost for the Vaillant P.3 fault is £90-250 including labour.

Vaillant P.3 Fault Code: What It Means & How to Fix It

What the manual says

Manufacturer manual

not available

From this model's manual

Verified against the Vaillant/Vaillant Ecotec Plus Pro 839592 00 2004 installation & service manual.

DIY fix possible

Check that your heating radiators are turned on and not blocked by closed valves.Ensure the system pressure is sitting at the correct level, usually between 1 and 1.5 bar.Restart your boiler using its reset button to see if the temporary temperature spike clears.

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 P.3: 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

F.20View →F.22View →F.23View →

All 119 fault codes on the ecoTEC plus 612 VU GB 126/3-5

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

d.00 d.01 d.02 d.03 d.05 d.06 d.07 d.08 d.09 d.10 d.11 d.17 d.18 d.19 d.22 d.23 d.25 d.26 d.30 d.33 d.34 d.35 d.36 d.40 d.41 d.44 d.47 d.50 d.51 d.60 d.61 d.64 d.65 d.67 d.68 d.69 d.70 d.71 d.72 d.73 d.75 d.76 d.77 d.78 d.80 d.81 d.82 d.83 d.84 d.90 d.91 d.93 d.97 F.00 F.01 F.02 F.10 F.11 F.13 F.20 F.22 F.23 F.24 F.27 F.28 F.29 F.32 F.60 F.61 F.62 F.63 F.64 F.65 F.70 F.71 F.72 F.73 F.74 F.75 F.76 P.1 P.2 P.4 P.5 P.6 S.00 S.01 S.02 S.03 S.04 S.05 S.06 S.07 S.08 S.10 S.11 S.13 S.14 S.15 S.16 S.17 S.20 S.21 S.22 S.23 S.24 S.25 S.26 S.27 S.28 S.30 S.31 S.32 S.34 S.36 S.53 S.54 S.76

Your boiler has detected that the water temperature is rising far too quickly, which usually points to a temporary blockage or poor water flow through the system.

What the manual says

DIY fix possible

Avoid the next call-out bill

Related fault codes

All 119 fault codes on the ecoTEC plus 612 VU GB 126/3-5

Related guides you might find useful

Hot water works but heating does not

No hot water but heating works

Banging, kettling or whistling noise

Recently viewed