Vaillant F.62: Gas Valve Shutoff Delay Fault
What the Vaillant F.62 error code means, what causes it, and why it's a job for a licensed BC gas technician — not a DIY reset.
Severity
Critical — stop using the boiler
Gas safety first
This fault involves gas, combustion or venting. If you smell gas (rotten-egg odour), hear hissing, or feel unwell, leave the building immediately and call 911 or FortisBC at 1-800-663-9911 from outside. Do not flip switches or relight anything. For all other cases, switch the boiler off and call a licensed gas technician.
What the Vaillant F.62 error code means
The gas valve is taking too long to shut off after the flame should be extinguished — a safety-critical gas-control fault.
On Vaillant ecoTEC plus and ecoTEC exclusive condensing boilers & combis, F.62 is a gas-supply / gas-valve fault. It is a protective response — the boiler is telling you something needs attention, and the safe, lasting fix is a proper diagnosis rather than repeated resets.
Symptoms you may notice
- Ignition lockout or flame failure
- No heat or hot water
- Fault clears briefly then returns
Common causes of Vaillant F.62
Why this is not a DIY fix
Anything touching the gas valve or gas supply — pressure, the valve itself, or supply sizing — is legally restricted to licensed gas fitters in BC. Manometer testing and gas-valve adjustment are not DIY tasks, and getting them wrong is dangerous.
In British Columbia, gas work must be performed by a TSBC-licensed gas fitter. GasBoilers.ca — a CanroHeat division — sends Red Seal–certified, gas-licensed technicians who diagnose the true cause, repair it correctly, and verify safe operation before they leave.
How our technicians diagnose & repair it
- 1Measure static and working gas pressure with a manometer
- 2Confirm the meter, regulator and gas line are correctly sized
- 3Test the gas valve and its modulation
- 4Adjust combustion to specification with analysis
Related Vaillant codes
Vaillant F.62 — FAQ
What does the Vaillant F.62 error code mean?
The gas valve is taking too long to shut off after the flame should be extinguished — a safety-critical gas-control fault. On Vaillant ecoTEC plus and ecoTEC exclusive condensing boilers & combis, this is categorised as a gas-supply / gas-valve fault.
What causes Vaillant F.62?
The most common causes are: Delayed or sticking gas valve; Flame-signal delay (sensing electrode/condensate); PCB fault. A licensed technician confirms which one applies before any part is replaced.
Can I fix Vaillant F.62 myself?
No. Anything touching the gas valve or gas supply — pressure, the valve itself, or supply sizing — is legally restricted to licensed gas fitters in BC. Manometer testing and gas-valve adjustment are not DIY tasks, and getting them wrong is dangerous. Repeatedly resetting the boiler without fixing the root cause can be unsafe and can cause further damage. Call GasBoilers.ca at 604-359-1081 for a licensed diagnosis.
Is the Vaillant F.62 error code dangerous?
It can be. This fault involves combustion, gas or venting. If you ever smell gas, leave the building immediately and call 911 or FortisBC at 1-800-663-9911 from outside. Otherwise, switch the boiler off and book a licensed technician.
How much does it cost to fix Vaillant F.62 in Greater Vancouver?
Cost depends on the root cause and any parts needed. We start with a flat-rate diagnostic, then quote the repair before any work begins — no surprises. Call 604-359-1081 for current pricing and same-day availability.
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