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There are three possibilities for the relay not to engage:
The control circuit is open.
The relay coil burned out.
It is also possible that there is a mechanical cause, for example, there is a foreign object in the place of engagement, which causes the seizure.
If it is not combustible is caused by the low pressure you said later, you can solve this problem, I don't know what material you use the pipe, if it is an iron pipe, it is estimated that there is rust and slag blocked, if it is a plastic pipe, it is estimated that it is stuck when it is bonded, it is recommended to find a plumber to check the pipe.
It is more convenient to wash in winter. It is also possible to boil water with the stove yourself, but it is too much trouble.
Your toilet and kitchen hot water pipes are not connected.
There may be limescale in the pipes or faucets! The water heater is not working if the amount of water is too small!
Clean and hygienic. Easy to use. Especially in the big winter.