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Hello, please could you specify the exact model of your boiler?
OK bear with me...If you receive an alert of a phone call offer, you can ignore it - these are system generated and outside my control. If you wish to speak to me then you can initiate a call at any time, and I will tell you whether or not I can pick up. You won't be charged if we don't get connected.
I'm just typing my response to you...
Again, I'm in the middle of typing my response!
My answer might be disappointing, but don't shoot the messenger!As I suspect you already know, E133 means:"Interruption Of Gas Supply or Flame Failure"This covers many eventualities, which are:1. Failure in the flame detection function;2. Igniter or electrode fault;3. Gas valve fault;4. PCB fault.The problem now is that unless you're familiar confident to work inside the boiler casing, with an understanding of how to diagnose the problem and find the faulty component, you're better off calling a local qualified engineer. I believe that Baxi offers a fixed-price repair option, possibly contingent on a service contract, but that can be good value. How soon you can get someoneTo answer your question about hot water, unfortunately the flame ignition/detection function is key to both hot water and heating, so you're stuck. Like I said, this is disappointing, but the intermittent nature makes this nigh on impossible to solve from distance.
There is one hope...If you are confident enough, you can power off the boiler, remove the casing, locate the ignition lead and check its condition. You might spot a loose connection, or a chafed cable, or something equally obvious, which you can then fix.
I'm pleased to be able to help. These times are indeed challenging.Stay safe, and keep well :-)