15
FAULT FINDING
6 720 802 048 (2013/05)
7 FAULT FINDING
If a boiler fault occurs, please read the following page thoroughly before contacting Worcester, Bosch Group.
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, and display a flashing Reset light on the control panel.
If the condensate pipe has frozen:
▶ 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.
▶ 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.
▶ 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.
▶ If the boiler does not restart, contact Worcester’s Technical Support Team (0844 892 3366) for assistance.
▶ Contact your installer in order to find a permanent solution to the problem.
Problem Cause Remedy
Desired room temperature is not
reached
Thermostatic radiator valve(s) set too low ▶ Increase thermostatic radiator valve setting(s)
Temperature control for central heating
flow on boiler set too low
▶ Increase central heating flow temperature
control setting
Air trapped in heating system
▶ Bleed radiators and recharge heating system
Desired room temperature
exceeded by large amount
Radiators are too hot ▶ Turn down thermostatic radiator valves/room
thermostat
▶ Reduce central heating temperature by turning
down the Central Heating control on boiler
Heating stays on for too long Clock is incorrectly set ▶ Check setting and adjust
No ON/OFF mains indicator Momentary power failure ▶ Switch off boiler at master switch, wait a few
seconds then switch on again
Hot water temperature too low Temperature set too low ▶ Check setting and adjust
Water flow at tap too high
▶ Reduce flow rate at tap
Hot water temperature too high Temperature set too high ▶ Check setting and adjust
Water flow at tap too low
▶ Increase flow rate at tap
WARNING: Falling hazard!
Failure to follow this guidance can result in personal injury.
▶ Only attempt to thaw a condense pipe that is at ground level, which is easily accessible.
▶ Never attempt to thaw a condense pipe which is at height.
CAUTION: Pipe damage
▶ DO NOT use boiling water to thaw the condensate pipe!
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