Glow-worm Ultracom 30cxi Intermittent Hot Water

26 Jan 2015
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United Kingdom
Have Glow-worm Ultracom 30cxi combi boiler.
When demand for DHW for bath it just runs cold.
The boiler will supply hot to bathroom wash basin tap and to downstairs sink hot tap ...but not to the bath. Any suggestions as to possible cause, please?
Thanks for any help. AL
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Cold or warm water from bath tap ? partially open the bath tap not fully and you,ll get hot water.

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