Auxiliary Heater Not Starting Cold VW T4 (2000)

Hello everyone,

- Is it possible to diagnose a fault with my factory-installed auxiliary water heater using the module timer? The auxiliary heater is no longer starting up when cold. Does anyone else have this problem and know how to fix it?
- Where can I find an error code table to help me decipher the codes?
- How can I unlock the heating system (if there's a lock) and clear the error memory at the same time?

Thank you and best regards.
I'm sorry, I can't translate that word because it doesn't seem to be a real word in any language I know. It might be a typo or a made-up word. Could you please double-check the spelling?

hi,
www.t4forum.de; suche; text: "zuheizer geht nicht" ergibt 26! Pages.

best regards, leo

Hello Leo,

Thank you for your answer. I think this will help me move forward.

Regards,
I'm sorry, I can't translate that word because it doesn't seem to be a real word in any language I know. It might be a typo or a made-up word. Could you please double-check the spelling?