F.60 Boiler Fault Code: What It Means on Every Brand

The F.60 fault code appears on 2 boiler brands — Protherm and Vaillant — and on all of them it points to the same kind of problem. The details still differ by brand (thresholds, sub-codes, reset procedure), so use the table below to jump to the page for your boiler.

Lockout — engineer likely 2 brands use this code

Which brand is your boiler?

The brand is printed on the front casing. Tap your brand for the full causes, fixes and repair costs.

Brand	What F.60 means	Severity	DIY?
PProtherm	The F.60 code on Protherm boilers signals a fault on the positive side of the gas valve control circuit — in other words, the boiler's PCB (control board) has detected a problem with the… Full guide →	Lockout — engineer likely	No
VVaillant	The F.60 code appears when the boiler's PCB (Printed Circuit Board) has detected a problem communicating with or controlling the gas valve. Full guide →	Lockout — engineer likely	No

F.60 brand by brand

Protherm F.60

The F.60 code on Protherm boilers signals a fault on the positive side of the gas valve control circuit — in other words, the boiler's PCB (control board) has detected a problem with the electrical signal or supply it sends to the gas valve to open and regulate gas flow. Because the boiler cannot safely confirm the valve is responding correctly, it locks out and shuts down both heating and hot water as a precaution. F.60 sits in a cluster of related gas valve codes: F.61 covers a fault on the negative side of the valve circuit, and F.62 indicates the valve failed to close down properly. All three result in a lockout. This code appears across the Protherm Gepard range and closely related Panther, Puma Condens, Lynx Condens, and Bear Condens models that share a common fault-code system — always cross-check your own model's manual to confirm.

Causes, fixes & costs for Protherm F.60 → · All Protherm codes

Vaillant F.60

The F.60 code appears when the boiler's PCB (Printed Circuit Board) has detected a problem communicating with or controlling the gas valve. Vaillant describes this officially as a gas valve control defect — typically caused by a short circuit or earth leak in the wiring between the PCB and the gas valve, a faulty gas valve assembly, or a defective PCB itself. Because uncontrolled gas valve behaviour is a safety risk, the boiler locks out completely until the root cause is resolved. You'll have no heating or hot water until a Gas Safe engineer investigates. Note: F.60 is closely related to F.61 — both point to gas valve control faults and the two codes can appear interchangeably across different generations of the Vaillant ecoTEC range. F.60 tends to indicate a detected fault in the valve control circuit, while F.61 is more commonly associated with a valve that has failed to open or close correctly, but both require the same professional diagnosis pathway.

Causes, fixes & costs for Vaillant F.60 → · All Vaillant codes

Frequently asked questions

Is the F.60 fault code the same on every boiler?

Broadly, yes — on Protherm and Vaillant the F.60 code points to the same class of fault, and the recommended response is similar. Model-specific details such as sub-codes and reset procedures still vary, so follow the page for your own brand.

Can I fix a F.60 fault myself?

Not usually. On every brand listed, F.60 points to a fault that needs a suitably registered engineer to diagnose and repair. A single reset to rule out a transient glitch is reasonable; repeated resets are not.

Who should I call about a F.60 fault?

For gas boilers, a Gas Safe registered engineer — it is a legal requirement for any work on the appliance. If you smell gas at any point, leave the property and call the National Gas Emergency line on 0800 111 999.

General guidance only — not a substitute for professional advice, and not certified by a registered engineer. Any work on a gas appliance must be carried out by a Gas Safe registered engineer. If you smell gas, call 0800 111 999.