Ideal Boiler Control Thermostat CL6/PO148 004554

The Ideal 004554 is a boiler control thermostat, listed under the CL6/PO148 designation. It is the control that lets the user set the temperature the central heating system runs to, and it is used across the Ideal Cavalcade Visa range of back boiler units and associated fires. The thermostat regulates the appliance's heat output in response to the setting on the dial, so the boiler holds the chosen temperature rather than running flat out.

• The heating runs continuously regardless of where the dial is set, or never reaches the temperature selected.
• The boiler cycles on and off more frequently than expected, with the room temperature swinging either side of the set point.
• The control knob turns without any effect on boiler operation, or feels loose and does not engage.
• The appliance fails to respond to a call for heat even though the programmer and room thermostat are calling.
• Temperature control becomes erratic, with the boiler firing at times that do not match the dial position.

• Confirm the appliance GC number against the compatibility list, as the Cavalcade Visa BBU and fire variants use different GC references.
• Check the existing thermostat against part number 004554 and the previous number 589960051 before ordering.
• Have the appliance details and serial number to hand when checking the correct control for the model.