Mine has a similar problem on hot and the same problem on cold. It's the valve at the back, you can buy them from F&P for around $25 and $30 depending on witch one you need. A handy person could replace, circuit board has to be removed to get at it but a methodical person could easily do it with little tools, costs is in labour and milage another $100 for a washer service person to look at it.
Tony, December 2008