Bosch Worcester Greenstar Si Series User Instructions page 17

EXTREME COLD WEATHER
In instances where the condensate pipe work is run external or in an unheated area, such as a garage,
it can be at risk of freezing, even if insulated.
A frozen condensate pipe will cause the boiler to shut down.
WARNING: Falling hazard!
Failure to follow this guidance can result in personal injury.
B Only attempt to thaw a condense pipe that is at ground level, which is easily
accessible.
B Never attempt to thaw a condense pipe which is at height.
CAUTION: Pipe damage
B DO NOT use boiling water to thaw the condensate pipe!
If the condensate pipe has frozen:
B Locate the blockage.
It is likely that the pipe is frozen at the most exposed point external to the building or where there
is some obstruction to flow. This could be the open end of the pipe, at a bend or elbow, or where
there is a dip in the pipe in which condensate can collect. The location of the blockage should be
identified as closely as possible before taking further action.
B Thaw the frozen pipe.
The pipe can be thawed by applying a hot water bottle, a microwaveable heating pack (the sort used
for muscular aches and pains) or a cloth soaked in hot water to the exterior of the pipe, close to
the point of blockage. Hot water can also be poured onto the pipe from a watering can or similar
container.
B Once the pipe has been thawed the boiler must be reset, press the reset button for five seconds
and wait two to three minutes for the boiler to restart.
B If the boiler does not restart, contact Worcester's Technical Support Team (0844 892 3366) for
assistance.
B Contact your installer in order to find a permanent solution to the problem.
6 720 643 356a (2010/10)
FAULT FINDING
17