Can I Connect Washer With Cold Hose Only?

This thread was marked as solved. Here's a summary of the problem and the fix, generated from the discussion below.

Bosch WFF1201 washing too hot due to inlet supply confusion

The problem

After moving house, an older Bosch WFF1201 was washing too hot when the boiler had hot water available. The concern was whether the machine could be run using only the cold inlet hose.

Likely cause

The thread supports that the issue was likely due to the machine being connected incorrectly for its fill arrangement, with hot water being supplied where a cold fill connection was expected, or the hot/cold supplies being connected wrongly.

What fixed it

The accepted advice was to identify whether the machine is cold fill or hot-and-cold fill. If it is a cold fill machine with one valve, it should only be connected to the cold water supply and not to a hot supply. If it is a true hot-and-cold fill machine with two valves, it should normally be connected to both correct supplies unless the instruction book states otherwise. The original poster confirmed the advice resolved the issue.

Checks to try

• Checked whether the machine has one water valve or two
• Considered whether the inlet hose arrangement matched the machine’s fill type
• Observed that washing ran too hot when the boiler had hot water