Worcester Bosch Thermostat Ranco C28P1436 87161423350

The Worcester Bosch 87161423350 is a thermostat supplied under the Ranco C28P1436 reference. It is the temperature-sensing control used on the manufacturer's oil-fired Danesmoor and Heatslave appliances, where it monitors the boiler or store temperature and switches the burner in and out to hold the set point. It is a direct replacement for the original control on the models listed below.

• The boiler fails to fire, or fires only intermittently, because the thermostat no longer calls for heat.
• Domestic hot water or heating runs consistently hotter or cooler than the temperature set on the control.
• The burner short-cycles, running for brief periods and then shutting down before the set point is reached.
• Turning the temperature control has no effect on boiler operation, or the control feels loose and does not click.
• The appliance overheats and trips repeatedly on the high limit stat.

• Check the GC number 392-822 and the appliance data plate to confirm the boiler model and age match the compatibility list.
• Confirm the thermostat currently fitted carries the Ranco C28P1436 reference before ordering.
• Cross-reference the earlier Worcester number ZAMAJ013 if you are working from older service literature or an older parts list.
• Oil-fired appliance work should be carried out by a competent engineer in line with current regulations.