morco super compact feb24e problems

Owners of a Morco FEB-24E boiler, commonly used in static caravans, often face issues with temperature control due to the limited capabilities of the boiler’s mechanical timer. In colder climates, especially, maintaining a comfortable and consistent temperature can be challenging. This article discusses how to upgrade the Morco FEB-24E with a wireless programmable thermostat, providing better temperature control and comfort.

Problem: Inadequate Temperature Control in Static Caravans

The Morco FEB-24E boiler’s mechanical clock timer limits temperature control, making it difficult to maintain a consistent and comfortable temperature in a static caravan, particularly in extremely cold conditions.

Solution: Installing a Wireless Programmable Thermostat

Installing a wireless programmable thermostat can provide more precise control over the heating system. Here’s a step-by-step guide to modifying the Morco FEB-24E boiler to work with a wireless thermostat, such as the Honeywell CMT927.

Step 1: Disconnecting the Mechanical Timer

  1. Access the Boiler Wiring: Refer to the boiler’s wiring diagram to locate the connections.
  2. Remove Existing Connections: Disconnect the connections from the clock on the first connector of J4. Also, disconnect the stat wire from the second connection.

Step 2: Wiring the RF Receiver

  1. Identify the RF Receiver Connections: On the RF receiver (e.g., Honeywell BDR91), identify the T1 and T2 connections. On most models, T1 is marked as ‘A’ and T2 as ‘B’.
  2. Connect the RF Receiver to the Boiler: Connect the T1 wire from the RF receiver to the first connection of J4 on the boiler. Then, connect the T2 (call for heat) wire to the second connection of J4.
  3. Powering the RF Receiver: Ensure the RF receiver is powered by linking the live wires. This is crucial for the receiver’s electronics to function correctly.
  4. Alternative Connection: If the boiler doesn’t fire up with the above setup, try linking L in the BDR91 receiver to A. However, this should only be attempted after confirming the voltage going into connections 1 and 2 on J4.

Step 3: Finalizing the Setup

  1. Testing the Configuration: After wiring, test the thermostat to ensure it’s controlling the boiler effectively.
  2. Adjusting the Setup: If issues arise, revisit the wiring, especially the connections to J4. Ensure the control wires (A and B) are correctly connected, and the receiver has a permanent 240V supply to L and N.

Important Considerations

  1. Safety Precautions: Always ensure the power is turned off before working on the boiler’s wiring.
  2. Consulting with Professionals: If you’re unsure about the wiring process, consult with a professional electrician or heating engineer.
  3. Compliance with Regulations: Ensure all modifications comply with local electrical and safety regulations.


Upgrading a Morco FEB-24E boiler with a wireless programmable thermostat can significantly improve temperature control in a static caravan. This setup provides more flexibility and comfort, especially in colder climates. Careful attention to the wiring process and adherence to safety protocols are essential for a successful installation. For the best results, professional assistance is recommended, particularly if you’re unfamiliar with electrical systems.

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