104.71 GBP
Worcester MT10 Replacement Mechanical Timer for Cdi, Si, and Junior Boilers
The Worcester MT10 is a replacement mechanical timer designed for use with Worcester Cdi, Si, and Junior boilers. This single-channel timer offers precise control over heating schedules, ensuring optimal efficiency and performance
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Worcester MT10 Replacement Mechanical Timer
The Worcester MT10 is a precision-engineered mechanical timer designed specifically for Cdi, Si, and Junior boilers. Its robust construction and reliable operation make it an ideal replacement component for homeowners and technicians seeking to restore or upgrade their boiler systems.
Key Features
- Single Channel Design: The MT10 operates on a single electrical channel, simplifying installation in existing boiler circuits.
- 24‑Hour Mechanical Operation: Unlike electronic timers, the MT10 uses a purely mechanical mechanism that guarantees consistent performance regardless of power fluctuations.
- Compatibility: Fully compatible with Worcester Greenstar and Bosch boiler models such as the 24i, 28i, and Junior series.
- Easy Installation: The timer plugs directly into the boiler’s existing control board, requiring no additional wiring or configuration.
- Durable Build: Constructed from high‑grade steel housing and precision bearings to withstand continuous operation over many years.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model Number | MT10 |
| Voltage | 24 V DC |
| Current Rating | 0.5 A (typical) |
| Operating Temperature | -10 °C to +60 °C |
| Dimensions | Approx. 70 mm × 50 mm × 30 mm |
| Weight | ~0.25 kg |
Installation Guide
- Safety First: Turn off the boiler and disconnect power to avoid electrical shock.
- Locate the Existing Timer: Identify the current mechanical timer on the boiler’s control board. It will typically be a small, rectangular unit with a single plug.
- Remove Old Timer: Unscrew or unplug the existing timer carefully, noting any wiring connections for reference.
- Insert MT10: Align the new MT10’s plug with the corresponding socket and secure it in place. Ensure that the mechanical dial is positioned correctly to match the desired heating schedule.
- Reconnect Power: Restore power to the boiler and verify that the timer operates as expected, adjusting the dial if necessary.
Operational Characteristics
The MT10’s mechanical gear train allows for precise timing of boiler activation. Users can set the desired start time by rotating the dial; the timer will then trigger the boiler at that exact moment each day. Because it relies on a mechanical clock rather than electronic circuitry, the MT10 remains unaffected by power surges or brownouts.
Maintenance Tips
- Periodically inspect the dial and gears for smooth operation; lubricate with a light machine oil if any resistance is felt.
- Avoid exposing the timer to excessive moisture or dust, which can impair mechanical function.
- If the timer fails to start the boiler at the set time, check for loose connections or worn gear teeth and replace as needed.
Why Choose the Worcester MT10?
The Worcester MT10 offers a blend of reliability, simplicity, and compatibility that is hard to match. Its mechanical nature eliminates dependence on software updates or firmware patches, ensuring uninterrupted operation for years. For technicians working with older boiler models, the MT10 provides an easy-to-install solution that restores full functionality without extensive rewiring.
Conclusion
The Worcester MT10 Replacement Mechanical Timer stands out as a dependable component for maintaining and upgrading Cdi, Si, and Junior boilers. Its single‑channel design, 24‑hour mechanical precision, and straightforward installation make it an essential tool for both homeowners and professionals seeking to keep their heating systems running smoothly.
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Category
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- Timers - Boilers & Accessories |
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| Tags | Junior Boilers Worcester MT10 Replacement Timer for Cdi |
| Alternative searches | Si boiler timer Cdi boiler timer Boiler timer switch Junior boiler timer Si mechanical timer MT10 mechanical timer Biasi mechanical timer Ideal mechanical timer Worcester boiler timer Junior mechanical timer Drayton mechanical timer Ferroli mechanical timer Siemens mechanical timer Vaillant mechanical timer Glow-worm mechanical timer Honeywell mechanical timer Potterton mechanical timer Worcester mechanical timer Cdi boiler mechanical timer Mechanical timer for boilers Replacement mechanical timer MT10 replacement mechanical timer |
| Identifiers | |
| Brand | ![]() Bosch is a brand of power tools and appliances. The company was founded in 1886 and produces a wide range of power tools, appliances, and accessories. Bosch tools are known for their quality and durability, and the company is a leader in innovation and design. |
| MPN | Bosch HP7716192036 |
| ID | 4422777 |
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| Key Features | |


