Check and repair immersion timer

My immersion heater works and heats the water normally, but the clock dial on the Optimum OP-ECOSAVE timer does not advance automatically, so the timed function is not working. I’m looking for an electrician to check whether the fault is with the timer or its electrical connection and complete the repair during the same visit. Please bring a compatible replacement timer if possible, so a second call-out is not required. The €100 budget is for the call-out, diagnosis and labour. If a replacement timer is needed, please confirm the cost with me before fitting it. Please include your maximum total price, including VAT and any replacement timer, in your offer. Location: Oranmore, County Galway.