How did he come to that conclusion?

Is the same tech there every time?

Why does he think it is losing direction?

How did he reset the direction?

Did he use a pressure gauge to trouble-shoot the valve?

What is the exact name of the part he said needed replaced?

Are you working on the answers to the questions I have asked?

I'm not sure if you are giving us bad information or if your tech is giving you bad information that you are relaying to us?

Ask the tech what the DBG is at the top and bottom? If he doesn't know what DBG means, you may want to seek out another contractor!

Let's try another route! How many hours have they been there in the last 60 days trouble-shooting this problem?