Sink water going to radiators

moneysurfing

I have a following problem.

Scenario1:
If the gas boiler turned off and sink or bath only is turned on radiators are going hot. How it's possible?

Scenario 2:
If I turn off the sink and bath and running only the gas boiler and keep valve to the hot water tank open - radiators stay cold and have hot water only at the hot water tank. Otherwise if I turn off the valve to the boiler - radiators are hot again. Anybody know any solution for this problem?

scudo2

When you say sink/bath are you talking about the electric immersion switch ?

With the gas, do you have seperate control / zones with the rads and hot water tank ?

moneysurfing

scudo2 wrote: »

When you say sink/bath are you talking about the electric immersion switch ?

With the gas, do you have seperate control / zones with the rads and hot water tank ?

1./ yes I mean electric immersion switch.

2./ no I don't have separate controllers on gas boiler, there is only switch on-off and spinning button from 1 to 6, it's a Ideal Classic on the stickers.

scudo2

moneysurfing wrote: »

1./ yes I mean electric immersion switch.

2./ no I don't have separate controllers on gas boiler, there is only switch on-off and spinning button from 1 to 6, it's a Ideal Classic on the stickers.

Is the pump running / vibrating on the gas boiler when boiler is OFF ?

If yes then you need an RGII service eng. to call and check the over run thermostat on the boiler.

moneysurfing

no the pump is not running if the boiler is off

alancar89

moneysurfing wrote: »

no the pump is not running if the boiler is off

Is the cylinder old? Could be a leaking coil?