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Errors


Boiler type Helix VX-075

Error code E51

Cause:

Supply temperature sensor is open. No continuity.

Solution:

1. Is harness plugged into Supply Water Sensor? Is harness plugged into Control Module J5?
Yes: -> 2
No: Insert Harness

2. Disconnect J5 from control module. Using digital meter measure check continuity of white wires between control board and sensor. Continuity? 
Yes: -> 3
No: Replace wires 

3. Unplug J5 connector on comtrol board. Using digital meter measure resistance between terminals J5-11 and J5-3. Estimate sensor temperature. Does it fall in the range of the resistance chart? 
Yes: Repalce control module.
No: Replace supply water sensor.