IBC Technologies · Error codes
IBC VX “Fan pressure” alert
Error – Fan Pressure
The manual lists this alert when the fan power consumed by the safety and ignition module (SIM+) exceeds its threshold during operation. It is a protective check that the fan is not being overloaded, which is often a sign the air path is harder to push through than it should be.
Applies to
This alert is shown by the V-10 touchscreen controller on VX Series residential boilers (VX 110, VX 150 and VX 199), as documented in IBC Installation & Operating Manual — VX 110 / VX 150 / VX 199, doc 120-347E6, sections 9.2–9.4.
Controller: V-10 touchscreen controller. Source manual: 120-347E6 (2026-08-07).
Why a code is not a diagnosis
The alert does not reveal why fan power is high: a blocked vent or intake, an obstructed flue passage, a failing fan, or an electrical fault are all on the manual's check list. Diagnosis requires measuring the vent path and the fan circuit.
Safe things to observe
- Note the alert text and whether it recurs during heating, hot-water production or both.
- Check the vent terminal from a safe distance for blockage or obstruction.
- If a CO alarm sounds, leave the building and call 911 from outside.
Do not
- Do not reset the boiler repeatedly while the condition persists.
- Do not attempt to clean or modify the fan or vent components yourself.
How professional service helps
- A technician checks the vent and combustion-air paths for restriction, including screens, elbows and terminals.
- Fan operation, harness connections and control output are verified.
- The fault history is reviewed and the boiler is test-fired before it is returned to service.
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 →Combustion fan (blower)
The combustion fan is the sealed boiler's lungs: it draws in combustion air, keeps the burner's gas-air mixture correct, and pushes flue gases out…
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 IBC Technologies VX Series.
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
- IBC Installation & Operating Manual — VX 110 / VX 150 / VX 199, doc 120-347E6, sections 9.2–9.4 · 120-347E6 · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.