Hi guys, quick recap of my issue.
Ravenheat RSF82ET, currently 8/9yrs old. Heat Exchanger replaced 2 years ago due to kettling - not sure actual underlying cause, but also had DHW symptom of hot water, cold water, hot water, cold water etc.
Current problem:
Hot water for say 30 secs, then turns off the burner for 10 secs, fires up and repeats. You can tell that it's going to do it as the water goes scalding hot before it cuts off, despite the HW contol being set to low.
HOWEVER - this is intermittent. For example yesterday it did this first thing - scalding hot then a cut out. But later in the day, it worked as normal - ie not the hottest water in the world but reflecitve of the setting and hot enough for washing etc - and more importantly - constant.
In my limited knowledge, I'm thinking either HE knackered again (just by association with my last major prob), or could it be the HW thermister. For info, I've unplugged the thermister, but same thing has happened - scalding hot then a cut out.
Flow etc is unaffected. Problem defintely increases in regularity if I try turning the HW control higher.
Thanks!
Ravenheat RSF82ET, currently 8/9yrs old. Heat Exchanger replaced 2 years ago due to kettling - not sure actual underlying cause, but also had DHW symptom of hot water, cold water, hot water, cold water etc.
Current problem:
Hot water for say 30 secs, then turns off the burner for 10 secs, fires up and repeats. You can tell that it's going to do it as the water goes scalding hot before it cuts off, despite the HW contol being set to low.
HOWEVER - this is intermittent. For example yesterday it did this first thing - scalding hot then a cut out. But later in the day, it worked as normal - ie not the hottest water in the world but reflecitve of the setting and hot enough for washing etc - and more importantly - constant.
In my limited knowledge, I'm thinking either HE knackered again (just by association with my last major prob), or could it be the HW thermister. For info, I've unplugged the thermister, but same thing has happened - scalding hot then a cut out.
Flow etc is unaffected. Problem defintely increases in regularity if I try turning the HW control higher.
Thanks!