I am not sure if I am in the right section, my advance apologies if it isn't.
Could anyone shed some light as to why my Mother in law's 5 year old boiler won't provide CH and it is Ok for DHW.
It has no fault codes on the LCD panel, it is showing "d" for DHW and when you open the hot water tap it fires away fine, and the white burner indicator flashes briefly and goes steady and then stops when you have clsoed the tap. The display then reverts to 0 and the fan and the pump stops.
But won't fire CH, checked the room thermostate and the wiring which is fine, checked the thermostate makes the contacts when CH is demanded, the knob on the front is turned to max. And the timer is on a 24hr setting too.
Secondly, I can't seem to find anywhere how Ideal Isar HE30 senses the demand for the DHW.....errrr seems to be no microswitch or flow sensor being used on this boiler to detect when the DHW tap is opned up???
Seems like they are using thermistors to detect the DHW flow sensing, otherwise how would it know when to give DHW priority from the CH mode, my thoughts were that the DHW demand sensor may be stuck in DHW so i wanted to check if this boiler used a diaphgram method or a flow sensor to detect the demand for the DHW, since this demand overrides the CH and so may be why it is stuck in DHW mode and won't run her heating.
I also removed the motorised actuator from the diverter valve and it is the CP type with 3 wires, and it is not faulty or stuck, since when i switch the mains off and On again, it activates (retracts) briefly and then pops out again pushing the pin on the diverter valve.
The Installation manual states that make sure there are no drips from the tap.
I belive the circuit may be overly sensitive that any drips can throw this boiler into permanent DHW mode!!! that sounds like a bad design if the circuit is overly sensitive to go into DHW mode just on a few drips from a leaky or a dripping hot water tap. That surely is not right!
Any help would be welcome on this, and I think one of her hot water mixer taps in her kitchen is a bit leaky or dripping, it is a ceramic 1/4turn taps in her kitchen sink that may be causing it the drips through wear and tear.
But I just want to know how the heck does this boiler sense the demand for a DHW ??? as I can't see anywhere it mentioned on teh circuit diagram or shown anywhere, so what kind of sensing does it deploy??
Could anyone shed some light as to why my Mother in law's 5 year old boiler won't provide CH and it is Ok for DHW.
It has no fault codes on the LCD panel, it is showing "d" for DHW and when you open the hot water tap it fires away fine, and the white burner indicator flashes briefly and goes steady and then stops when you have clsoed the tap. The display then reverts to 0 and the fan and the pump stops.
But won't fire CH, checked the room thermostate and the wiring which is fine, checked the thermostate makes the contacts when CH is demanded, the knob on the front is turned to max. And the timer is on a 24hr setting too.
Secondly, I can't seem to find anywhere how Ideal Isar HE30 senses the demand for the DHW.....errrr seems to be no microswitch or flow sensor being used on this boiler to detect when the DHW tap is opned up???
Seems like they are using thermistors to detect the DHW flow sensing, otherwise how would it know when to give DHW priority from the CH mode, my thoughts were that the DHW demand sensor may be stuck in DHW so i wanted to check if this boiler used a diaphgram method or a flow sensor to detect the demand for the DHW, since this demand overrides the CH and so may be why it is stuck in DHW mode and won't run her heating.
I also removed the motorised actuator from the diverter valve and it is the CP type with 3 wires, and it is not faulty or stuck, since when i switch the mains off and On again, it activates (retracts) briefly and then pops out again pushing the pin on the diverter valve.
The Installation manual states that make sure there are no drips from the tap.
I belive the circuit may be overly sensitive that any drips can throw this boiler into permanent DHW mode!!! that sounds like a bad design if the circuit is overly sensitive to go into DHW mode just on a few drips from a leaky or a dripping hot water tap. That surely is not right!
Any help would be welcome on this, and I think one of her hot water mixer taps in her kitchen is a bit leaky or dripping, it is a ceramic 1/4turn taps in her kitchen sink that may be causing it the drips through wear and tear.
But I just want to know how the heck does this boiler sense the demand for a DHW ??? as I can't see anywhere it mentioned on teh circuit diagram or shown anywhere, so what kind of sensing does it deploy??