Unfortunately you are going to need a complete new engine.
The things to check first are.1 That the main valve coming into your house is fully open. 2 Then check that the valve on the line to the shower is fully open. If these valves are not fully open then there may not be enough water getting to your shower to cool it properly, the overheat safety devicewill turn the power off until it cools, then it then it starts to heat again andso on.
Make sure that the shower headis clean and clear, that the hose isn’t kinked (this can happen just behind thehand set where it is difficult to see) also check the inside of the hosealthough it can look OK on the outside it could have collapsed internally The other possibility is a faulty flow/stabilizer valve not allowingthe correct amount of water into the shower. If thisis the case then you are going to need a new engine, you will have to selectone with the same output as your existing shower.
ithink this came with a 2 year warranty
I think the Pressure Relief Device (PRD) has blown.
It’s a safety device on the bottom of the heating tank.
It is fairly easy to replace however there is usually something that causes it to blow, often a kink in the hose or the showerhead is blocked, so check this before fitting the new PRD.
Unfortunately Aqualisa do not sell this part as a spare they will only supply a shower engine which is effectively all the working components.
If you do choose to change over the engine make sure you select the same power rating as your current shower
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