On Monday, 11 December 2017 12:29:06 UTC, www.GymRatZ.co.uk wrote:
On 11/12/2017 10:29, www.GymRatZ.co.uk wrote:
Shop boiler has turned up it's toes after almost 18 years abuse.
It's a valiant TurbomaxPlus 828E which has been kettling for a while and
now come up with F20 (overheat) code preceded earlier with by mechanical
bangs and crashes.

Thing is, it's never had any issues and runs at least 16 hours a day, 5
days a week from Autumn to Spring so I'm wondering whether to fix or
replace with a new-fangled condensor boiler which I know won't be as
maintenance free.

Just going to see if it's the pump that's gone. (never been replaced in
all this time) but what would be a suitable "commercial" alternative?

Update, Pup is spinning fine. Temperature from burner to pump inlet is
hot but nthing is flowing past the outlet of pump to heat exchanger.

Is there a chance the heat exchanger could be blocked?

Cheers
Pete

blockage might be anywhere, including in the pump, or filter if it has one. Maybe try some cleaner chemical (F3). If no joy, time to dismantle stuff.


NT