Worcester Bosch Control Unit Lop-22 With Code Plug 8737604246

The Worcester Bosch 8737604246 is a control unit supplied with code plug 25152, listed by the manufacturer under the control boxes spare category. It forms part of the control and PCB assembly inside the appliance, handling the switching and sequencing signals the boiler needs to run through its operating cycle.

The assembly is specific to the Worcester Bosch Greenstar 1000 Series platform, in particular the GR1000W 24 C NG models listed below. Because the code plug is matched to the appliance, the unit must be replaced with the same part number to keep the control configuration correct.

• The boiler fails to fire or will not run through its start sequence.
• The appliance locks out repeatedly, or locks out shortly after resetting.
• The display or control panel becomes unresponsive, blank or erratic.
• Heating or hot water operation is intermittent with no obvious mechanical cause.
• Visible damage, scorching or moisture tracking on the control board or its plug connections.

• Check the appliance GC number and model against the compatibility list, as the control unit is matched to the Greenstar 1000 Series GR1000W 24 C NG.
• Confirm the part number on the existing control unit and code plug before ordering, as the code plug is specific to the appliance configuration.
• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
• Inspect the wiring harness, connectors and any seals disturbed during access, and replace them if they show signs of heat damage or contamination.