My name is XXXXX XXXXX I am an authorized service technician for fisher & paykel and dcs and i can help you if you will allow me to do so?
I am soory to hear of your heating troubles with this machine. It is one that i am very familiar with. I can show you how to diagnose the problems you are experiencing with this machine. It is quite easy will take no time at all to do.
For the best and most acurate diagnosis, you may need an ampmeter though. But don't worry, if you don't have one, we can run through the diagnosis process.
Is this a dual fuel model> gas cooktop
and electric oven
Does this machine have 4 burners up top on left then grill and grittle on the left?
if the machine doest heat properly, taking too long to come up to temperature, or doesn't even come up to temperature set, we can test the heating elements and make sure they are receiving full power from the oven relays and computer board.
and after we do these checks we will determine what is wrong with your machine. I can even refer you to a couple of websites were you can purchase the parts at wholesale prices. saving you a fortune.
And if you don't have the time to do the checks and walk through the diagnosis process, i can refer a technician to you if want.
i look forward to answering your question and helping you get your machine fixed correctly.