Cylinder Thermostat - White
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Product Information
Full details
This B&Q Cylinder Thermostat is designed for surface mounting on domestic hot water cylinders, offering installers and maintenance engineers a dependable, simple, and accurate temperature control solution. Its key benefit is providing a direct, fully compatible replacement for models like the Honeywell L641A, ensuring seamless integration into existing systems. A potential caveat is its surface-mounting design, which requires specific installation considerations for optimal performance.
All features
| Colour | White |
|---|---|
| Model Part Number | L641A1039 |
| Brand | B&Q |
Extended Product Information
FAQs
What is this thermostat a direct replacement for?
This thermostat is a direct like-for-like replacement for the Honeywell L641A1039 Cylinder Thermostat.
What is the maximum temperature setting?
The thermostat features an adjustable dial with settings up to 80°C.
What is included in the kit?
The kit includes the thermostat unit, a cylinder strap with hooks, mounting screws, and a protective cap.
How is the thermostat mounted?
It is designed for surface mounting on domestic hot water cylinders using the provided strap and screws.
Can this thermostat be used with smart home systems?
No, this is a standard mechanical thermostat and does not have smart home integration capabilities.
What safety certifications does it have?
It is CE and UKCA marked, meeting relevant safety and performance standards.
What components can this thermostat control?
It can directly switch a wet central heating circulating pump or boiler, or operate spring return and motor open/motor close zone valves.
Troubleshooting
Thermostat not turning on heating
Verify power supply to the heating system. Check wiring connections to the thermostat and heating components. Ensure the cylinder temperature is below the set point.
Heating runs continuously
Check wiring connections. Confirm the temperature setting is not excessively high. Ensure the thermostat is making good contact with the cylinder.
Inaccurate temperature readings
Ensure the thermostat is securely strapped to the cylinder and making direct contact. Check for any obstructions or insulation preventing accurate temperature sensing.
Pros and Cons
Pros
- Direct compatibility with popular Honeywell models simplifies replacement.
- Easy-to-use adjustable temperature dial for precise control.
- All necessary components for installation are included.
- Robust build quality ensures durability and longevity.
- Meets required safety certifications for reliable use.
Cons
- Surface mounting may not be suitable for all cylinder types.
- Requires basic electrical knowledge for installation.
- Does not include smart features or remote control.
Setup, Compatibility & Care Instructions
Setup:
- Ensure power to the heating system is safely isolated before installation.
- Mount the thermostat using the provided strap and screws, ensuring good contact with the cylinder surface.
- Connect the thermostat to the heating system components (pump or zone valves) according to the wiring diagram.
- Install the protective cap over the thermostat.
- Restore power and set the desired temperature using the adjustable dial.
Compatibility:
This thermostat is designed as a direct replacement for Honeywell L641A models. It is suitable for use with wet central heating systems, circulating pumps, boilers, and spring return/motor open/motor close zone valves.
Care:
Clean the exterior of the thermostat with a soft, damp cloth. Avoid using abrasive cleaners or solvents. Ensure the protective cap remains in place to prevent dust and moisture ingress. Periodically check that the mounting strap remains secure.