No hot water. Boiler lockout. Error F28.
Vailant boiler model TURBOMAX VUW GB 252/2-5 R1, combination boiler TURBOMAX PLUS 824E. It displays error code F28. The manual says: "Boiler goes to lock out. No gas, Insufficient gas, Incorrect gas valve adjustment, electrode defective, ignition lead defect, electronic igniter defective." Transco engineer visited and said: "The igniter is working. Gas pressure is fine."
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