Good afternoon,
New to this place as a Google search finds me a few threads on the Main 30HE combi, so thought I'd try my luck..
New house with a Main 30HE Combi, 12 year old. Seller was adamant it still worked, much to my dismay things went wrong from there.
Been here since end of May and we have had a continual nightmare since. Firstly, thermostatic mixer on the shower fires the boiler up for 10-15 seconds, the boiler then shuts down, this then repeats for the duration of the shower. The mixer has been replaced, problem continues. I can observe the push rod from the diverted valve contacting the micro switch then retracting leaving 3-5mm, then slowly back out again. Sometimes, the push rod never comes out and remains in hibernation, providing nothing but a cold shower which puts me straight in the dog house with the missus!
In terms of work done so far, new heat exchanger and diaphragm. Cappileries taken off and cleaned (not mucky) and a filter on the right hand side also removed and shows no sign of cloggage. My engineer has had this thing in bits 4 times now and observed no real scaling or debris. He is stumped.
Only a couple of weeks ago the HW tap in the kitchen was on the blink, providing HW once then not again for some hours. Or taking 30-40 seconds for the push rod to reach the switch. Since the taking apart and minimal cleaning this seems to have remidied itself. But the shower continues to cycle.
Apologies if this was TLDR material but I’m loathed to get a Baxi engineer out and even more so to get a new boiler. Please, someone out there help me!
TIA. Alex.
New to this place as a Google search finds me a few threads on the Main 30HE combi, so thought I'd try my luck..
New house with a Main 30HE Combi, 12 year old. Seller was adamant it still worked, much to my dismay things went wrong from there.
Been here since end of May and we have had a continual nightmare since. Firstly, thermostatic mixer on the shower fires the boiler up for 10-15 seconds, the boiler then shuts down, this then repeats for the duration of the shower. The mixer has been replaced, problem continues. I can observe the push rod from the diverted valve contacting the micro switch then retracting leaving 3-5mm, then slowly back out again. Sometimes, the push rod never comes out and remains in hibernation, providing nothing but a cold shower which puts me straight in the dog house with the missus!
In terms of work done so far, new heat exchanger and diaphragm. Cappileries taken off and cleaned (not mucky) and a filter on the right hand side also removed and shows no sign of cloggage. My engineer has had this thing in bits 4 times now and observed no real scaling or debris. He is stumped.
Only a couple of weeks ago the HW tap in the kitchen was on the blink, providing HW once then not again for some hours. Or taking 30-40 seconds for the push rod to reach the switch. Since the taking apart and minimal cleaning this seems to have remidied itself. But the shower continues to cycle.
Apologies if this was TLDR material but I’m loathed to get a Baxi engineer out and even more so to get a new boiler. Please, someone out there help me!
TIA. Alex.
its in a housing with a filter and flow regulator. All worth checking 
