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thanks tony just tested capacitor and it has failed again only reads 0.5uf when i put it in it was 2.5uf

hi I had a fault with my vaillant ecomax 835E about 6 months ago it started to show f22 in the lcd & would not run i found the pump wasn't running & after a little fault finding found the 2.5uf capacitor was faulty on the pump . which i replaced with one of an old pump I had in the garage...