NTI Trinity Lx 329 — Abnormal Recycle: Hardware Invalid Ac Line
329
Abnormal Recycle: Hardware invalid AC line. An abnormal recycle was recorded because the hardware reported a fault involving invalid AC line, and this alert reports the recycle event. The table classifies it as Alert.
If a carbon-monoxide alarm sounds
- Leave the building immediately and get fresh air.
- Call 911. Do not go back inside until emergency services say it is safe.
- Have every fuel-burning appliance inspected before use.
Only after that, call ROMA about the boiler. Official guidance: Health Canada on carbon monoxide.
Applies to
This venting or air-supply fault code is displayed by the Trinity Lx control on Trinity Lx models (Lx150 through Lx800), as documented in Trinity Lx 150–800 Installation and Operation Manual, doc 99986573 V.2024-06-28, Tables 17-3 and 17-4 (99986573). Codes can differ between controller generations, so always check the manual that matches your unit.
- NTI Boilers Trinity Lx
- NTI Trinity Lx150
- NTI Trinity Lx200
- NTI Trinity Lx300
- NTI Trinity Lx400
- NTI Trinity Lx500
- NTI Trinity Lx600
- NTI Trinity Lx700
- NTI Trinity Lx800
Controller: Trinity Lx control. Source manual: 99986573 (2024-06-28).
Why a code is not a diagnosis
A venting or air-supply code points at the combustion-air path: a blocked terminal, a restricted flue, a failed fan, or a condensate restriction. It does not say which, and running an appliance with a blocked flue is unsafe.
Safe things to observe
- If a carbon-monoxide alarm sounds anywhere in the building, leave immediately and call 911 from outside.
- From a safe distance, check that the vent terminal and combustion-air inlet are not blocked.
- Do not run the appliance while a blockage is suspected.
Do not
- Do not put anything into the vent or air-intake openings.
- Do not remove or modify vent pipe.
How professional service helps
- A technician inspects the full vent and combustion-air path, clears blockages and checks the fan.
- 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
Is this code a carbon-monoxide danger?
The code relates to combustion or venting, so treat any CO alarm as an emergency and call 911 from outside. The appliance itself should be checked by a technician before it runs again.
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
- Trinity Lx 150–800 Installation and Operation Manual, doc 99986573 V.2024-06-28, Tables 17-3 and 17-4 · 99986573 · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.