Appendix; A Detecting And Rectifying Faults - Vaillant MAG HK 13-2/0-3 H Operating Instructions Manual

Appendix

Appendix
A Detecting and rectifying faults
Problem
Ignition malfunction
Automatic shutdown of the
burner after 45± 3 minutes
No hot water with slightly
opened water tap
No hot water with water tap
open
Vapour at the flue gas open-
ing
Hot water is white
After closing the hot water
valve, the ventilator contin-
ues running
Fluctuating water temperat-
ure and flow rate
Water leak at the expansion
relief valve
Whistling noise during opera-
tion
10
Possible cause
Air in the gas line
Safety device has switched on
Flow rate is below 2.5 L/min
Remaining cold water in the line
The water in the flue gas condenses in the cold air
Air that is dissolved in the cold water escapes
Ventilator supplies the burner with outside air
Additional water taps are opened or closed
Expansion relief valve opens to reduce excess pres-
sure
Uneven gas flow, low gas pressure
Solution
Opening and closing the water tap several times
( Please ensure there is a momentary pause in
between each water tap opening and closing)
Closing the water tap for a short time
Increasing flow rate at the water tap
Discharge the cold water
No fault
No fault
No fault
No fault
Limit the cold water pressure at the inlet to less
than 1.0 MPa (10 bar) and more than 0.014 MPa
(0.14 bar). Ask a competent person for details.
Inform the competent person/customer service
department and have them check the gas pres-
sure.
Operating instructions turboMAG pro 0020208984_00