Description
Ferroli Optima 901 Clock-24 Hour (LCD) zu01021xa (803840)
This Ferroli clock 24 hour LCD gives you full control over your boiler’s heating schedule. The boiler timer control improves efficiency by setting start and stop times for heating and hot water. Part number 39803831 (also known as ZU01021XA or 803840) replaces faulty time clocks in multiple Ferroli boiler models.
Compatible Boilers
To help you make the right choice, this timer is compatible with the following boiler models:
Ferroli DOMIcompact Series:
F24B (03/05/2005) – GC No. 47-267-35 (30K0235001)
F24E (03/2000) – GC No. 47-267-31 (30R0547/1)
F30B (11/01/2007) – GC No. 47-267-36 (30K0236002)
Ferroli Falcon Series:
Falcon 11 – GC No. 47-267-26 (30R0374/0)
Falcon 80 – GC No. 47-267-01
Ferroli Optima Series:
Optima 2001 – GC No. 47-267-21
Optima 201 – GC No. OPT 201
Optima 701 – GC No. 47-267-16
Optima 800 – GC No. 47-267-08
Optima 900 – GC No. 47-267-13
Optima 901 – GC No. 47-267-18
If you’re looking for a Ferroli Optima 201 24 Hour Clock follow the link provided.
Why Choose This Product?
The 39803831 Ferroli boiler timer restores your ability to manage heating cycles with accuracy and ease. It helps reduce energy waste and keeps your home comfortable. Each unit is refurbished to strict standards, offering excellent value and dependable operation. It’s ideal for both quick repairs and longer-term maintenance.
Delivery and Return
We ship same day on orders placed before 1 PM, Monday to Friday. Choose from standard or next-day delivery at checkout. You may return unused items in their original condition within 30 days.
Always use a Gas Safe registered engineer when installing or replacing boiler components.
Frequently Asked Questions
1. What boilers is the Ferroli Optima 901 Clock compatible with?
This 24-hour LCD timer is compatible with Ferroli DOMIcompact series (F24B, F24E, F30B), Falcon series (Falcon 11, Falcon 80), and Optima series (Optima 2001, 201, 701, 800, 900, 901). Always check your boiler’s model number before ordering to ensure compatibility.
2. What is the purpose of the 24-hour LCD clock?
The clock allows full control over your boiler’s heating and hot water schedule. By setting start and stop times, you can manage energy usage, improve efficiency, and maintain a comfortable home temperature.
3. Is this a new or refurbished part?
This Ferroli boiler timer is fully refurbished. It has been quality checked and tested to ensure reliable operation, making it a cost-effective and dependable replacement for faulty units.
4. How do I install the Ferroli 901 clock?
Installation should always be carried out by a Gas Safe registered engineer. The timer replaces your existing boiler clock and connects directly to the control panel. Professional installation ensures safety and correct operation.
5. How quickly can I receive this timer?
Orders placed before 1 PM, Monday to Friday, are dispatched the same day. You can select standard or next-day delivery at checkout to suit your needs.






