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1. Check that all isolating valves are open, see diagram 5 and water flows from the hot water taps.
2. If you are in any doubt about the boiler being filled with water contact your installer or Glow-worm's own
service organisation using the telephone number on the inside front cover of this booklet.
Do not operate the boiler without water.
3. Check that the electrical supply to the boiler is ON and set any remote controls as required.
4. With the User controls in their "OFF" (0) positions, turn the Mains Reset Switch to the ON (1) position,
the running lamp will initially illuminate (green) then go off, the system pressure will be displayed and should read
on the digital display, at least 0.7bar (recommended 1.0bar), if less, pressurise as described in the Digital/Display
System Pressurisation section.
Digital Display/System Pressurisation
The digital display, see diagram 4, normally shows the operating temperature of the unit when there is a central heating demand
and gives a pressure reading when there is no demand or when the appliance is in the domestic hot water mode.
If the digital display shows pressure less than 0.7bar, re-pressurise the system to 1bar by gently opening the built in filling tap
underneath the boiler, see diagram 3. A tap extension tool is provided to facilitate this. Ensure the tap is closed. If the system
repeatedly looses pressure, YOU MUST CONTACT YOUR INSTALLER OR GLOW-WORM'S OWN SERVICE ORGANISATION
USING THE TELEPHONE NUMBER ON THE INSIDE FRONT COVER OF THIS BOOKLET.
If there is a fault, then a fault symbol displays and the control light on the control panel flashes red.
WARNING:
Never try to service or repair the appliance by yourself and only start the appliance once a skilled professional has
repaired the fault.
Boiler Operation
Diagram 3
Diagram 5
Diagram 4
Tap Extension Tool
Filling Tap
Isolating Valves
Shown Closed