Biasi garda plus he Hot water Fault

[Peterbox]

Hi all. My Biasi boiler has just developed a fault on the hot water system only ( central heating seems OK ) Initially it has excessive temperature on the primary circuit then goes into safety thermostat lock out.
The C.H. temp gauge also shoots up to 80+ degrees.
Any ideas?

 

[Agile]

Blocked plate heat exchanger!

Caused by the installer not power flushing the system when the boiler was fitted.

Tony

 

[pandahouse68]

Blocked plate heat exchanger!

Caused by the installer not power flushing the system when the boiler was fitted.

Tony

My problem is the other round ,hot water ok but central heating isn't,
please tell me what to do .many thanks

 

[Agile]

You should ideally start your own new thread but I will answer you as there is not much written here.

What are the exact model and serial numbers?

What setting is the time clock in and what does its display show?

Do you have a room stat and whats it set at or showing on its display?

Tony Glazier

 

[pandahouse68]

You should ideally start your own new thread but I will answer you as there is not much written here.

What are the exact model and serial numbers?Biasi garda Plus ,
Model 1031520040 and Serial NO: N065080906

What setting is the time clock in and what does its display show?
from 10pm till 7am daily in Winter. Temperature/Pressure gauge shows 80deg+ at 1.5 bar.,and according to the user manual it states Excess temp at primary curcuit.

Do you have a room stat and whats it set at or showing on its display?
No I don't have Room Stat


many thanks
Tony Glazier

 

[pandahouse68]

You should ideally start your own new thread but I will answer you as there is not much written here.

What are the exact model and serial numbers?Biasi garda Plus ,
Model 1031520040 and Serial NO: N065080906

What setting is the time clock in and what does its display show?
from 10pm till 7am daily in Winter. Temperature/Pressure gauge shows 80deg+ at 1.5 bar.,and according to the user manual it states Excess temp at primary curcuit.

Do you have a room stat and whats it set at or showing on its display?
No I don't have Room Stat


many thanks

 

[Agile]

Thats not the model number which starts with an "M".

It sounds as if the diverter valve motor is not operating. You need to measure the voltages on its connections in DHW and in HW modes.

If thats correct then you can remove the head and see if the motor is moving.

Depressing the diverter valve pin manually should make it work in CH when its set for a CH demand.

Tony