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Bosch Greenstar Combi 151 not able to keep up
I got a bosch combi unit installed last year. I am having some trouble with it. It is not able to keep up on a cold day. I am wondering if it is related to any of the settings not set correctly. I tried calling the contractor who did the install but, he is not very helpful. Now, he doesn't even pick up my call.
How do i check if all the settings are correct?