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Vaillant - F81 F91 no hot water
Hi, My Vaillant boiler (eco tech plus) doesn't warm the water anymore. This morning it flashed between F81/F91 faults. When I put the heating on, that does work, the display shows s.97, then s.2, s.3, s.4, the flame and the radiators get how. When I put the water on I get s.24, then s.26...- chr!stian
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- Replies: 4
- Forum: Plumbing and Central Heating
