IBC Technologies · Error codes
IBC SL G3 “Low water pressure” alert
Error – Low Water Pressure
The manual lists this alert when the boiler's inlet water pressure reads below 4 psi. A sealed hydronic system needs enough pressure to keep water in the boiler and push it around the building, and the control flags a reading it considers too low to fire safely.
Applies to
This alert is shown by the V-10 touchscreen controller on SL Series G3 residential boilers (SL 10-85 G3, SL 14-115 G3, SL 20-160 G3 and SL 30-199 G3), as documented in IBC Installation & Operating Manual — SL 10-85 G3 / SL 14-115 G3 / SL 20-160 G3 / SL 30-199 G3, doc 120-276E13, sections 9.2–9.4.
Controller: V-10 touchscreen controller. Source manual: 120-276E13 (2026-08-11).
Why a code is not a diagnosis
Low pressure can come from a leak, a failed expansion tank pushing water out through the relief valve, a faulty fill valve, or a pressure-sensor fault. The alert does not identify the cause, and repeated low-pressure alerts usually mean a leak or expansion problem rather than normal evaporation.
Safe things to observe
- Read the pressure gauge and note the cold-system pressure (your installer sets a normal cold pressure, often around 12-15 psig).
- Look for visible drips or wet spots near the boiler, pumps, pipe joints and the relief-valve discharge pipe.
- If you find a fast leak or standing water, turn the boiler off at its service switch and call a licensed technician.
Do not
- Do not keep re-pressurizing a system that keeps losing pressure without finding the cause.
- Do not cap or block the relief-valve discharge pipe.
- Do not add water while the boiler is very hot unless you are certain of the correct procedure.
How professional service helps
- A technician pressure-tests the system and locates leaks, including hidden ones in floors or walls.
- The expansion tank charge and the fill assembly are checked and corrected.
- The pressure sensor and its connections are verified if no leak is found.
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 →
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 SL Series G3.
Frequently asked questions
Why does my boiler pressure drop every winter?
Falling pressure usually means a slow leak or a failed expansion tank, not seasonal evaporation — a sealed system does not consume water. A technician should find the cause rather than you topping it up all season.
Can I add water myself?
On a sealed system with a manual or automatic fill valve, topping up is common, but you need to know the correct cold-fill pressure and watch that the boiler does not keep losing water. If it does, call a technician.
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 — SL 10-85 G3 / SL 14-115 G3 / SL 20-160 G3 / SL 30-199 G3, doc 120-276E13, sections 9.2–9.4 · 120-276E13 · accessed September 7, 2026
Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.