Viessmann Vitocrossal 200 F F4 — No Flame Formation during Safety Time; Ionization Flame Monitor Reports no Flame Signal
F F4
No flame formation during safety time; ionization flame monitor reports no flame signal. Ionization electrode incorrectly adjusted; ionization electrode not plugged in; ground fault of electrode or cable. Insert plug of ionization electrode; check cables; adjust ionization electrode
If you smell gas
- Stop what you are doing. Do not use phones, switches, matches or anything that can spark inside.
- Go outside and leave the door open behind you.
- Call the FortisBC 24-hour emergency line at 1-800-663-9911 or dial 911.
Only after that, call ROMA about the boiler. Official guidance: FortisBC gas leaks and odour.
Applies to
This ignition fault code is displayed by the GW6B control on CM2 models (CM2-186 through CM2-620), as documented in Vitocrossal 200 CM2 Service Instructions (small sizes, GW6B), doc 5584 109 - 16 (05/2021) — larger sizes in 5546 489 - 15 (5584 109 - 16). Codes can differ between controller generations, so always check the manual that matches your unit.
- Viessmann Vitocrossal 200 (CM2, GW6B)
- Viessmann Vitocrossal 200 CM2-186
- Viessmann Vitocrossal 200 CM2-246
- Viessmann Vitocrossal 200 CM2-311
- Viessmann Vitocrossal 200 CM2-400
- Viessmann Vitocrossal 200 CM2-500
- Viessmann Vitocrossal 200 CM2-620
Controller: GW6B control. Source manual: 5584 109 - 16 (2021-05).
Why a code is not a diagnosis
An ignition code says the burner did not prove a flame when it should have; it does not say why. Gas supply, ignition components, grounding, venting and the control module each need testing on site.
Safe things to observe
- If you smell gas, stop, go outside and call your gas utility's emergency line or 911 before anything else.
- Note the exact code and what the appliance was doing when it appeared.
- Check whether other gas appliances in the building are working.
Do not
- Do not keep resetting to force more ignition attempts.
- Do not open the gas valve, touch ignition components or bypass any safety device.
How professional service helps
- A licensed gas technician tests gas supply pressure and the shut-off state.
- The ignition probe, lead, gap and grounding are inspected against the manufacturer's specification.
- Combustion and safety devices are verified with an analyser and the manufacturer's procedure after any repair.
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Parts and service
Parts commonly involved
These parts appear in the documented text for this alert. A code reports a condition, not a failed part — a technician confirms the cause by testing before anything is replaced.
Ignition electrode
The ignition electrode creates the spark that lights the burner in a gas boiler, and on many models it also senses the flame once it is burning.
What a technician checks →Flame sensor (flame rod)
The flame sensor is the small rod that proves a gas boiler's burner is actually lit before the control will keep the gas valve open.
What a technician checks →
Service for this alert
- Gas Boiler Repair
Licensed gas technicians from ROMA Heating & Cooling diagnose and repair residential and light-commercial gas boilers across…
- Emergency Boiler Repair
Priority gas boiler repair for homes and buildings in Greater Vancouver with no heat, no hot water, a locked-out boiler or a leak.
Every boiler part explained — what it does, how it fails and what a technician checks.
Documented for Viessmann Vitocrossal 200 (CM2, GW6B).
Frequently asked questions
Does this code mean I have a gas leak?
Not by itself. If you smell gas, stop, leave the building and call your gas utility's emergency line or 911 from outside before anything else. Otherwise the code points to a fault a technician confirms on site.
Can I clear this code myself?
Clearing a code without fixing its cause usually just brings it back. Note the code, check the safe items on this page, then call a licensed technician. If your appliance manual describes a user reset for this exact code and it stays away, no call may be needed.
Boiler locked out? Call with the alert text ready.
The brand, model and this alert are passed along when you request service online, so the technician arrives prepared.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
- Vitocrossal 200 CM2 Service Instructions (small sizes, GW6B), doc 5584 109 - 16 (05/2021) — larger sizes in 5546 489 - 15 · 5584 109 - 16 · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.