Bosch Thermotechnology · Error codes
Buderus GB142 6A 227 — No Ionization After Four Startup Attempts
6A 227
No ionization after four startup attempts. No ionization after four startup attempts, so press the Reset button and, if the fault message 6A recurs, measure the static inlet gas pressure, bleed the gas supply pipe of air, and check the hot surface ignitor. The table classifies it as Locking boiler-fault code.
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 BC10 control on Buderus GB142 models (24–60), as documented in Buderus GB142 Service Instructions, doc 7214 9400 (chapter 7 fault codes) (7214 9400/07). Codes can differ between controller generations, so always check the manual that matches your unit.
- Bosch Thermotechnology Buderus GB142
- Buderus GB142-24 kW
- Buderus GB142-30 kW
- Buderus GB142-45 kW
- Buderus GB142-60 kW
Controller: BC10 control. Source manual: 7214 9400/07 (2011-12).
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.
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
- Buderus GB142 Service Instructions, doc 7214 9400 (chapter 7 fault codes) · 7214 9400/07 · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.