Borderline Fan Pressure. Clean Heat Exchanger?

[Radam87]

Hi

I had my boiler serviced and was told the fan pressure was -4.9.

The manual says pressure "must be greater than -4.9. Pressures below indicate that the heat exchanger will require cleaning".

The engineer said it will be fine until next year when it is recommended I have a strip down service. Is this sound advice or does it actually require cleaning? I have a feeling it was cleaned last year by BG but cannot be 100% sure.

Many thanks

 

[Stadan20]

Assuming this is a Worcester. Model would be helpful

 

[Radam87]

Assuming this is a Worcester. Model would be helpful

Yes Worcester. 532.

 

[Stadan20]

Yes Worcester. 532.

And the model ......?

 

[Radam87]

And the model ......?

532.

 

[Stadan20]

Yes borderline I would of suggested the same, providing all other checks were ok

 

[Radam87]

Yes borderline I would of suggested the same, providing all other checks were ok

Cheers. Any advantages or disadvantages to cleaning at this reading? Other tests were passes apparently.

High Comb:
CO/Co2 ratio:0.0005
CO (ppm): 48
CO2%: 9.4

Low Comb
CO/Co2 ratio - 0.0000
CO (ppm) - 3
CO2% 8.7

Tightness test - Not done.
flue, combustion, burner ratio, ventilation all passed.
Operating pressure 18.57 mbar
Heat input 29.73 kW

 

[Stadan20]

Those readings are fine low is out by 0.1 but literally nothing to worry about , a full strip and clean of main heat exchanger will prolong the life and efficiency of the boiler and if it hasn’t been done before I would highly recommend that it is done as the burner seal is probably the original , also if the electrodes haven’t been replaced and you still have the original sight glass type I also would recommend they get replaced with the upgraded type.... was the kw rating also noted on the certificate ?

 

[Radam87]

Those readings are fine low is out by 0.1 but literally nothing to worry about , a full strip and clean of main heat exchanger will prolong the life and efficiency of the boiler and if it hasn’t been done before I would highly recommend that it is done as the burner seal is probably the original , also if the electrodes haven’t been replaced and you still have the original sight glass type I also would recommend they get replaced with the upgraded type.... was the kw rating also noted on the certificate ?

Electrodes have been changed. Not too sure about the seal.
Heat input 29.73 kW?
Have a feeling it was strip cleaned last year.

They said on the summary sheet I had no approved CO alarms but I pointed them out to them at the start ...

 

[Stadan20]

Electrodes have been changed. Not too sure about the seal.
Heat input 29.73 kW?
Have a feeling it was strip cleaned last year.

Kw rating is within , depends on what was done on the strip clean , there is one way they could of just taken off an inspection hatch and semi cleaned the main hex but there is no way that I can really tell from here lol . Maybe the service engineer added notes on the service sheet from last year what was done ?