Pressure Gauge Boiler Thema / Combitek 23
When you open the tap or turn on the heating, the pressure gauge of the Thema / Combitek 23 is responsible for measuring and controlling the pressure of the circuit. If this part fails, you may notice incorrect readings, which can cause the boiler to lock out due to low pressure or not regulate the temperature properly. This pressure gauge is compatible with models such as the Combitek C 23, F 23, Thema C 23 E, F 23 E, among others. A technician should confirm through diagnosis whether it needs to be replaced if you observe issues with the pressure or the system's operation.
- Type of part
- Pressure gauges & aquastats
- Status
- Refurbished
- internal SKU
- MCTNOXF24
- Warranty
- 1 year
Compatible Saunier Duval boilers
Manometer. Seven confirmed compatibilities: C 23 and F 23.
Proven compatibility
| Boiler model | Family | Verification |
|---|---|---|
| Saunier Duval C 23 | COMBITEK | Contrasted |
| Saunier Duval F 23 | COMBITEK | Contrasted |
| Saunier Duval C 23 E | THEMA | Contrasted |
| Saunier Duval F 23 E | THEMA | Contrasted |
| Saunier Duval THEMA19EC | THEMA19EC | Contrasted |
| Saunier Duval C 23 E | THEMAPLUS | Contrasted |
| Saunier Duval F 23 E | THEMAPLUS | Contrasted |
Can't see your model or have questions? The printed reference takes precedence. How to check it · Send us a photo via WhatsApp.
How to check if it is the part for your boiler
The part reference, model, and equipment revision must be verified against the manufacturer's documentation.
- Find the reference printed on the installed part and check whether it matches the catalogue reference —. If it is not visible, do not identify the part by its shape alone.
- Check the full boiler model on its data plate and look for it in the model associations on this page.
- Compare the connections and physical body with the original part before installation.
- If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Symptoms that require diagnosis on the manometer
The manometer shows the pressure of the boiler circuit. These are the typical symptoms and what to do:
Common symptoms and faults
- 01
The needle always stays stuck in the same position, not moving with the actual pressure.
Cause: The manometer mechanism gets stuck or the connection pipe is clogged with scale or dirt.
Open the filling valve for a moment and see if the needle reacts before declaring the pressure gauge faulty.
- 02
The reading does not match what the boiler does on a daily basis.
Cause: A partially obstructed connection duct delays the reading compared to the actual pressure of the circuit.
Fill up to the usual cold pressure and check if the needle still changes before replacing the part.
- 03
Water is leaking from the thread where the pressure gauge is connected.
Cause: The gasket of the fitting loses tightness over the years and with temperature changes.
Dry the area, tighten the fitting carefully, and check again before replacing the pressure gauge.
- 04
The gauge is broken or fogged up, and the red overpressure arc is not clearly visible.
Cause: A blow or the entry of moisture through a deteriorated joint renders the glass unusable.
Check if the fog is inside the glass, which cannot be cleaned from the outside, before deciding that it needs to be replaced.
These symptoms can have more than one cause. If your boiler displays a fault code, send it to us via WhatsApp along with a photo of the labeling, and we'll tell you if this is the part.
Saunier Duval pressure gauge datasheet
- Uniclima internal SKU
- MCTNOXF24
- Brand
- Saunier Duval
- Type of part
- Pressure gauges & aquastats
- Units in stock
- 6 units
- Status
- Refurbished
- Warranty
- 1 year
- Shipping
- Delivery time shown at checkout
- Return
- 14 days
Part data and available documentation
Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.
- Pressure range
- 0-4 bar (red overpressure arc approximately between 3 and 4 bar)
Manuals and technical documentation
Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.
- Saunier Duval C 23 E Manual (PDF) Document © Saunier Duval, provided as a technical reference.
Frequently asked questions about the pressure gauge
Does this manometer work for both the Thema C 23 E and the Combitek F 23?
What range does the gauge of the ThemaPlus F 23 E mark?
When is it advisable to change the manometer of the Thema19EC?
Is it the same part for the Thema F 23 E and the ThemaPlus C 23 E?
Spare parts related to Saunier Duval COMBITEK
