NTI Trinity FTVN 1 08 — Water Pressure Too Low
1 08
Water pressure too low. The boiler shut down because the water pressure inside the heating circuit is too low; listed causes are low water pressure, air in the system or lack of water pressure, improper boiler piping, improper expansion tank location, a malfunctioning pressure switch or bad wire harness, and a blocked plate exchanger or return filter. The table classifies it as Blocking (Auto Reset).
Applies to
This venting or air-supply fault code is displayed by the FTVN Series I control on FTVN Series I models (FTVN085, FTVN110, FTVN150, FTVN199 and combis FTVN110C, FTVN150C, FTVN199C), as documented in FTVN Series I Installation Startup Maintenance Instructions, doc 420011303800 Rev 2.28.23, Part 13-B Boiler Error Codes (420011303800 Rev 2.28.23). Codes can differ between controller generations, so always check the manual that matches your unit.
- NTI Boilers Trinity FTVN
- NTI Trinity FTVN085
- NTI Trinity FTVN110
- NTI Trinity FTVN150
- NTI Trinity FTVN199
- NTI Trinity FTVN110C
- NTI Trinity FTVN150C
- NTI Trinity FTVN199C
Controller: FTVN Series I control. Source manual: 420011303800 Rev 2.28.23 (2023-02-28).
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.
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.
Low-water cutoff
A low-water cutoff is the safety device that stops a boiler from firing when there is not enough water inside it.
What a technician checks →Expansion tank
An expansion tank gives heating water somewhere safe to go as it heats and grows, keeping pressure stable and protecting the relief valve.
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…
Every boiler part explained — what it does, how it fails and what a technician checks.
Documented for NTI Boilers Trinity FTVN.
Frequently asked questions
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
- FTVN Series I Installation Startup Maintenance Instructions, doc 420011303800 Rev 2.28.23, Part 13-B Boiler Error Codes · 420011303800 Rev 2.28.23 · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.