Firebird oil boiler hot water

[Westernr1]

My firebird oil boiler hw supply is luke warm, but does heat up slightly when run if the ch is on at the same time.
Is this a faulty diverter valve?
If so could I replace this myself as I've heard they're expensive to fix.
Tia

 

[SimonG]

What model firebird? Put a pic up of front with cover off.

 

[Westernr1]

What model firebird? Put a pic up of front with cover off.

 

[Westernr1]

I e also attached a picture of the plate inside

 

[SimonG]

No diverter valve on that model, it uses a twin pump. Are you in a hard water area? Have you tried turning up the blending valve?

 

[Westernr1]

In a soft water area, and yes have tried the blending valve. Have it turned all the way up and water only reading 36 degrees

 

[SimonG]

Is hot water pump operating when hot tap opens?

 

[Westernr1]

Is hot water pump operating when hot tap opens?

Yes pump is spinning.
Have removed the silver screw on the front and made sure it hasn't siezed up.
Gave it a few turns with a small screwdriver.
All good

 

[SimonG]

How hot is the heatstore?

 

[Westernr1]

How hot is the heatstore?

Sorry, not sure about this one?

Heatstore?