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Hi
I have a valiant plus ecotec 418, ( about 8-9 years old ) it has always had the same problem, continually going from S.5.3 to S5.4 and back again....when ever I check, the Delta T while running normally is around 20oC and I am told S.5.3 doesn’t occur until the DT is 30oC. The boiler fires up very quick, but as the inlet temperature increases only slowly, I assume this is when the 30oC is reached.
it stays in the S.5.3 stage for around 10 minutes, goes to S5.4, then fires up, exceeds the DT then goes back to S.5.3..this cycle continues until eventually it settles down and stays at S.5.4......although even before that is achieved, it often fails to reduce firing, even when only 2oC away from the target temperature of 78oC and shuts down on over temperature.
Vaillant tell me it’s likely restricted or undersized pipe work, which could have been due to my ‘ not so very clever’ builder during my house extension in 2003. So if the boiler flow is less than it should be, that could explain why the boiler manages to achieve the outlet temperature so quickly ( I also reduced the KW to between 5-10KW from 18KW ) also if the flow is low, could that explain why the inlet temperature lags behind the outlet temperature so much ???
So would a higher capacity / flow CH pump be the solution ??? The igniter system on this boiler must be excellent, as it fires up so so many times every day, far more than I would consider normal.
thanks
I have a valiant plus ecotec 418, ( about 8-9 years old ) it has always had the same problem, continually going from S.5.3 to S5.4 and back again....when ever I check, the Delta T while running normally is around 20oC and I am told S.5.3 doesn’t occur until the DT is 30oC. The boiler fires up very quick, but as the inlet temperature increases only slowly, I assume this is when the 30oC is reached.
it stays in the S.5.3 stage for around 10 minutes, goes to S5.4, then fires up, exceeds the DT then goes back to S.5.3..this cycle continues until eventually it settles down and stays at S.5.4......although even before that is achieved, it often fails to reduce firing, even when only 2oC away from the target temperature of 78oC and shuts down on over temperature.
Vaillant tell me it’s likely restricted or undersized pipe work, which could have been due to my ‘ not so very clever’ builder during my house extension in 2003. So if the boiler flow is less than it should be, that could explain why the boiler manages to achieve the outlet temperature so quickly ( I also reduced the KW to between 5-10KW from 18KW ) also if the flow is low, could that explain why the inlet temperature lags behind the outlet temperature so much ???
So would a higher capacity / flow CH pump be the solution ??? The igniter system on this boiler must be excellent, as it fires up so so many times every day, far more than I would consider normal.
thanks
