Appliance Repair Questions? Ask a Technician for Answers ASAP
Hello, my name is George. The following link is a fast disappearing service manual for those types of heater. It does not have your specific model listed in it but it will be of similar design. If it helps you then rate the answer appropriately, alternatively, await an answer from another expert who may know your specific model.
Creda 79258 Service Instructions
with kind regard