Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit

Laars Endurance issues

kcoppkcopp Member Posts: 3,554
Having an issue w/ a Laars endurance Combi boiler. Nat Gas.
Customer complains about inconsistent hot water output... also was/ is getting the F4 error.
Manual says to swap out the sensor in the boiler (2400-445) I did that and still the issues persist.
Issue also appears to be intermittent... Runs fine when I am there then shows up later.
This is the newer version grey/ gold jacket.

Leave a Comment

BoldItalicStrikethroughOrdered listUnordered list
Align leftAlign centerAlign rightToggle HTML viewToggle full pageToggle lights
Drop image/file


It looks like you're new here. If you want to get involved, click one of these buttons!