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Product Information Notice
Models: GB125/35
Subject: Field Action - Safety Rework Instructions
A ll work must be performed by a licensed or qualifi ed
contractor.
Summary
The GB125/35 oil-fi red boiler from Buderus may accumulate
combustion debris under certain conditions, resulting in the siphon
becoming clogged. A clogged siphon can block the fl ue pipe and
consequently may lead to increased formation of carbon monoxide
(CO) in the boiler. If the boiler also has an opening into the
installation room, CO can escape, posing a safety risk.
To minimize the safety risk Bosch is initiating a fi eld action for all
installed GB125/35 boilers.
The following actions are required for the GB125/35 model:
The burner control must be replaced with an upgraded
version (provided by Bosch free of charge).
The existing condensate siphon must be replaced with a new
one (provided by Bosch free of charge).
Replace the heat exchanger clean out cover seal if necessary
(provided by Bosch free of charge).
A labor allowance of up to $300 is available for carrying out this
fi eld action (a separate claim form is available and must be used for
labor reimbursement).
If you have any further questions, please contact us directly on
1-800-323-1943 or at
gb125.35recall@us.bosch.com
"GB125/35 Field Action" in the subject line.
Relevant Part Numbers
Description
Burner Control Unit
Condensate Siphon (w/ fl oat)
12 mm sealing cord (white)* w/silicone
8 mm sealing cord (blue)* w/silicone
* The specifi c sealing cord supplied depends on the date of production of
the boiler. We will supply the correct cord to you.
Data subject to change without notice | BTC 410004103 C | 01.2020
Required Field Action - Burner Control (LMO) Replacement
1.
Switch off the boiler and remove the front cover (Fig. 1).
2.
There is a clip located on the bottom and the top of the
Burner Control (LMO), which needs to be released for
disassembly. To remove use a fl at screwdriver, place it under
the clip and push it upwards to unlock the clip (Fig. 2 and Fig.
3). Afterwards you can remove the LMO (Fig. 4).
and reference
Part Number
8738806487
7747020450
8718578900
8718579535
1 of 5
Figure 1
Figure 2
Bosch Thermotechnology Corp.
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Summary of Contents for Bosch GB125
- Page 1 (CO) in the boiler. If the boiler also has an opening into the installation room, CO can escape, posing a safety risk. To minimize the safety risk Bosch is initiating a fi eld action for all installed GB125/35 boilers. The following actions are required for the GB125/35 model: ...
- Page 2 GB125/35 Field Action - Safety Rework Instructions Product Information Notice Required Field Action - Condensate Inspection Figure 3 CAUTION: Condensate is corrosive. Wear gloves and avoid contact with skin and clothing. Switch off the boiler then remove the existing siphon. Pour the condensate out of the siphon.
- Page 3 Product Information Notice GB125/35 Field Action - Safety Rework Instructions If the cover seal is not OK (Fig. 13), it must be replaced. Figure 10 Figure 13 Expose the clean-out cover by pulling out the remaining thermal insulation (Fig. 11).
- Page 4 GB125/35 Field Action - Safety Rework Instructions Product Information Notice Figure 14 Figure 16 Stainless steel cover w. 12 mm sealing cord (light blue) For boilers made prior to March 2011 Aluminum cover w. 8 mm sealing cord (blue) For boilers made March 2011 and after Figure 17 The following instructions apply to both versions.
- Page 5 GB125/35 Field Action - Safety Rework Instructions Product Information Notice Now apply silicone to the groove of the clean-out cover. The Figure 23 aim is to insert a 1-2 mm wide silicone bead all the way round the outer edge of the cover groove (Fig. 20-22).