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My Boiler issues. Vaillant 837 Blocked Main Heat Exchanger

https://youtube.com/watch?v=zmGPSI4Se-M

This is my boiler at home. The main heat exchanger is becoming blocked.
I explain the clues and what to look for on a service.
I also talk about the upcoming PCB videos I will try and do.
INJECTOR CLEANING TOOL:
http://rover.ebay.com/rover/1/710-53481-19255-0/1?icep_ff3=2&pub=5575378759&campid=5338273189&customid=&icep_item=333533584619&ipn=psmain&icep_vectorid=229508&kwid=902099&mtid=824&kw=lg&toolid=11111

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2) BAHCO Screwdriver with LED https://amzn.to/2Op5Ug1
2)BAHCO Screwdriver without LED https://amzn.to/2yEhLML

3)WERA Kraftform Kompakt Screwdriver https://amzn.to/2OnOe4K

4)WERA 0.8x4x100 Flat screwdriver https://amzn.to/2RNcpra

5) KNIPEX Alligator https://amzn.to/2RNctqU

5)KNIPEX Cobra https://amzn.to/2PA5YWY
same size as the alligator above just the “cobra” version

6)BAHCO Spanner https://amzn.to/2IW3iR8

6)BAHCO Spanner with slimline jaw https://amzn.to/2yHCq2i

7)CK Wire cutters https://amzn.to/2RP19dW
7)CK Wire cutters (shorter version) https://amzn.to/2OnJwnB

8)KNIPEX bent long nose pliers https://amzn.to/2IW9uZ3

9)TESTO 510 Digital U gauge https://amzn.to/2Cfz36a

9)TESTO Bluetooth U gauge https://amzn.to/2IW4t30

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11)Cheap as chips pick set!!! https://amzn.to/2OpK10o

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16)Tee bar 2.5mm https://amzn.to/2OqqSvd

17)Full Tee bar set https://amzn.to/2yAoIyk

18)10mm ratchet spanner (flex head) https://amzn.to/2IWCoZ9

19)8mm ratchet spanner (flex head) https://amzn.to/2IUDZP5

20)14mm/15mm spanner https://amzn.to/2Aa6wgZ

21)BAHCO small spanner https://amzn.to/2RRkKKH

22)Cheap Lock knife https://amzn.to/2IWatZf

23)Sharpie https://amzn.to/2IVrxPk

24)Injector cleaning pins link coming soon. Review to follow.
25)Rothenberger 18” heavy duty pipe wrench https://amzn.to/2ChkRd6
These are the heat duty ones I use.

26)Knipex (large) https://amzn.to/2OrgfIm

27)BAHCO 12” (not wide jaw) https://amzn.to/2Aatuob

28)Fluke 115 multimeter https://amzn.to/2OqaFpF

Drain down hose https://amzn.to/2RM4ZEN

Gas Tap Grease https://amzn.to/2SE0jRL

Led lights for van. https://amzn.to/2Bh7RTQ

Fluke 101 multimeter https://amzn.to/2PoLP5g

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Fluke Twist Guard probes
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Commando drills
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Weed Sprayer https://amzn.to/2Ryx1Hh

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NTC Clamps:
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