IBC Technologies · Error codes
IBC VX “Outlet Limited” display message
Outlet Limited
The manual lists this warning when the controller detects a difference greater than 40°F between the inlet and outlet temperature sensors. The boiler limits its output to protect the heat exchanger while the cause is investigated.
Applies to
This warning message 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
A large inlet/outlet spread usually means flow is too low — a failed pump, a flow restriction, or a stuck valve — or a temperature sensor reading wrongly. The warning does not identify which.
Safe things to observe
- Note the warning and whether rooms are still reaching temperature.
- Check whether a particular zone stopped heating, which can point to a valve or pump on that circuit.
Do not
- Do not keep pushing the boiler while a flow problem may exist.
How professional service helps
- A technician checks the pump, flow restriction points and the temperature sensors named in the manual.
- The system is balanced and the boiler's output limit is confirmed to clear.
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.
Heat exchanger
The heat exchanger is where a boiler transfers heat from the burner flame to the water that heats your home.
What a technician checks →Boiler sensors (thermistors)
Boiler sensors are small temperature probes, usually thermistors, that tell the control how hot the water and flue gases are so it can fire safely…
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…
- Gas Boiler Replacement
ROMA replaces old, failed or inefficient gas boilers in Greater Vancouver, handling removal, venting and gas-supply changes,…
Every boiler part explained — what it does, how it fails and what a technician checks.
Documented for IBC Technologies VX Series.
Frequently asked questions
Is Outlet Limited an error?
No. It is a warning: the boiler keeps running but limits output to protect itself while the flow or sensor problem exists. It should still be investigated.
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.