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:disappointed:Hi first time user needing advice on boiler problem. Vokera HE32 boiler developed return thermistor fault ( AL73 ). Do i need to drain whole system or can boiler be drained only, through drain valve ? So i can replace faulty thermistor Also noticed rads not fully hot at bottom. Will require clean and flush but no draining valve fitted on lowest rad. Will drain and fit one when i have a bit more time but at moment thermister fault is priority. All advise welcome.
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