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How long shoud it take to replace a diaphragm on a Vaillant?

We have a Vaillaint Turbomax VUW 242/1 E,282/1E

How long should it take a trained engineer to replace the diaphragm as we had no hot water but central heating was fine? Am thinking someone might be trying to scam me with a longer than necesssary job!

Thanks.
Alex, November 2010
alex how much did he charge?......that 50 quid was based on me (example) coming looking at the problem going to get the part then fitting

007, November 2010
well if eveything went to plan then 30mins is possible but.....ther is a pin that is connected to the diaphram you can access without takin much apart maybe he just pushed that in and out a few times to free it n silicone grease the pin sounds more likely

007plumber, November 2010
If it took 30 minutes was he just especially fast or is it likely he did something different to what he has claimed?!

Alex, November 2010
1 hour roughly not much longer about £50.00 labour plus diaphram

007plumber, November 2010
link Click here to see other fixes for Vaillant.