- Boilers
- Gas boiler
27
Immergas 27 on a gas boiler: insufficient water circulation
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
Immergas 27 means the boiler is overheating because water is not circulating properly through the primary circuit. Check the gauge reads 1 to 1.2 bar when cold and that no heating valves are closed.
Safety first
Stop and check this first
- If you smell gas: Immergas says to close the meter or main gas tap and, if you can, the boiler's gas tap, open doors and windows, use no naked flames, do not smoke and do not touch switches, sockets, doorbells or phones. Leave the home and call your gas distributor's emergency number from the street.
- Do not open the boiler to free the pump: Immergas describes that step in the installer section and tells the user not to open or tamper with the appliance. In Stand-by and Off it is still live.
Safe checks you can perform
- Pressure gauge reading when cold
- Radiator valves and shut-off valves
- Fault list in the information menu
- Bleeding and pump check by the technician
Leave these tasks to a qualified professional
- Do not attempt this professional task: Bleeding the pump and the system
- Do not attempt this professional task: Speed, flow and bypass
- Do not attempt this professional task: Freeing the pump and reading its signals
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Bleeding the pump and the system
What they doThe technician bleeds the pump and the heating circuit and checks that the air vent cap opens properly.
They must show youthe air coming out and the final pressure.
In writingthat the system was bled and the cold pressure.
Speed, flow and bypass
What they doReads the pump speed (d 1.2) and flow (d 1.4) in the information menu, and checks the bypass setting and that the speed does not go below the minimum.
They must show youthe speed and flow read.
In writingthe settings before and after.
Freeing the pump and reading its signals
What they doLooks at the pump alarm, which turns red with a blocked rotor, low supply voltage or an electrical fault, and carefully frees the shaft with the screw in the pump head if needed.
They must show youthe pump alarm and the pump turning.
In writingthe state of the pump and what was done.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Pressure gauge reading when cold
- Who:
- you.
- How:
- with the system cold, look at the needle of the gauge on the boiler front. Immergas asks for 1 to 1.2 bar. If it reads below 1 bar, top up with the tap underneath and close it when done.
- Result that matters:
- whether the system is short of water.
- If it read below 1 bar:
- Immergas lists lack of water among the causes of overheating; note how much you added.
- If it gets close to 3 bar:
- the safety valve may open; do not add more and tell the technician.
- Evidence to keep:
- a photo of the gauge before and after.
Evidence: Immergas Victrix Omnia V2, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047702SPA)
Radiator valves and shut-off valves
- Who:
- you.
- How:
- go round the home and check that the radiator valves and any visible heating shut-off valves are open, without opening the boiler.
- Result that matters:
- whether the water has somewhere to circulate.
- If valves were closed:
- open them; the boiler should start again on its own if this was the cause.
- If everything was open:
- air and the pump remain, which the technician checks.
- Evidence to keep:
- a note of which valves were closed.
Evidence: Immergas Victrix Omnia V2, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047702SPA)
Fault list in the information menu
- Who:
- you.
- How:
- press the information button for at least 1 second, step to d 0.9 and open the list of the last five faults.
- Result that matters:
- whether 27 repeats and whether it appears with 60 or 61, which Immergas uses for a blocked pump or air in the pump.
- If it appears with 60 or 61:
- tell the technician; it points to the pump.
- If 27 appears once and does not return:
- note the date and time and keep an eye on it.
- Evidence to keep:
- a photo of the fault list.
Evidence: Immergas Victrix Omnia V2, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047702SPA)
Bleeding and pump check by the technician
- Who:
- technician from an authorised company.
- How:
- bleeds the pump and the system, checks the air vent and, if the pump is blocked, frees it with the screw in the centre of the pump head.
- Result that matters:
- whether air comes out, whether the pump turns and whether water circulates again.
- If air comes out or the pump was blocked:
- the cause is confirmed and corrected.
- If all is fine and 27 returns:
- checks the bypass and the pump speed.
- Evidence to keep:
- a job sheet with the findings and the final cold pressure.
Immergas tells the user not to open or tamper with the appliance and not to attempt any repair. The pump is inside, next to live parts.
Evidence: Immergas Victrix Omnia V2, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047702SPA)
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Boilers
- Brand
- Immergas
- Product type
- Gas boiler
Known code variants
- E27
- Error 27 Immergas
- Immergas E27
- Victrix 27
- Victrix Omnia 27
What it means
On the Victrix Omnia V2, code 27 is insufficient circulation: the boiler overheats because not enough water circulates through the primary circuit. Immergas gives two causes: low circulation in the system, from a closed shut-off valve in the heating circuit or from air that has not been bled, and a blocked pump, which has to be started again. The boiler restarts on its own once normal conditions return, without pressing Reset. If the code persists, Immergas says to call an authorised company.
Warnings and stop conditions
- Criticaleditorial warning
If you smell gas: Immergas says to close the meter or main gas tap and, if you can, the boiler's gas tap, open doors and windows, use no naked flames, do not smoke and do not touch switches, sockets, doorbells or phones. Leave the home and call your gas distributor's emergency number from the street.
Evidence: Immergas Victrix Omnia V2, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047702SPA)
- Highsource verified
Do not open the boiler to free the pump: Immergas describes that step in the installer section and tells the user not to open or tamper with the appliance. In Stand-by and Off it is still live.
Evidence: Immergas Victrix Omnia V2, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047702SPA)
Symptoms and causes
Probable causes · in order
- Closed shut-off valve in the heatingCommon
Fits if 27 appears after closing radiators or a zone valve, or after building work. Immergas asks for a check that no shut-off valve in the heating circuit is closed.
Evidence: Immergas Victrix Omnia V2, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047702SPA)
- Air in the systemPossible
Fits if you hear water noise or bubbling, or if the system was refilled recently. Immergas asks for the system to be completely free of air, that is, bled.
Evidence: Immergas Victrix Omnia V2, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047702SPA)
- Blocked pumpPossible
Fits if 27 appears after the heating has not been used for a long time. Immergas says that after a long idle period the pump may be blocked and has to be started.
Evidence: Immergas Victrix Omnia V2, instrucciones y advertencias para instalador, usuario y encargado de mantenimiento (1.047702SPA)
Virtual technician
Does 27 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Immergas (Immerspagna) · 2026 · manual
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