14
FAULT FINDINGS
PROBLEM
CAUSE
REMEDY
Poor Flue Draught:
Obstruction.
Clear and clean.
Chimney too low.
Raise height above ridge.
Chimney too wide.
Fit flue liner 150mm (6”)
Crack in wall.
Repair cracks.
No flue liner
Fit flue liner
Excessive Flue Draught
High chimney.
Fit draught stabiliser venting to the outside
atmosphere.
Down Draught:
High trees
Raise chimney height.
High buildings
Raise chimney height.
Low chimney
Raise chimney height.
Positive pressure zone.
Check flue termination
Cooker Smoking
Insufficient primary air.
Provide additional room air inlet or adjust burner
air intake.
Chimney choked.
Clean chimney.
Downdraught.
Raise chimney height.
Poor combustion.
Check air supply.
Hot Plate Not Heating
Burner cutting out.
Increase cooker thermostat setting.
Utensils not flat.
Use machined based utensils.
Radiators Not Heating
Circulating pump not working.
Check and replace if defective.
(b)
Room thermostat set too low
Increase setting
(c)
Air in system.
Bleed system.
(d)
Pipe system faulty.
Check pipe sizes and circuit.
(e)
Excessive number of radiators
Turn off un-needed radiators.
(f)
Radiator valves not balanced
Adjust valves to give an even flow.
(g)
By-pass incorrectly set.
Adjust by-pass valve
8.
Domestic Hot Water Cylinder not getting
hot enough:
Cylinder too large
Use 180 litre cylinder
Flow pipe too large
Use 28mm bore pipe.
‘Balancing valve’ is closed.
Open ‘balancing valve’.
(d)
Cylinder thermostat set too low
Increase thermostat setting.
(e)
Circulating pump not working
Check and replace if defective.
(f)
Motorised valve not opening
Check and replace if defective.
9.
Intermittent Performance
Cooker starved of primary air.
Provide air inlet in room.
(b)
Extraction fan in room.
Provide additional air inlet in room.
(c)
Dirt in nozzle
Clean or replace nozzle.
(d)
Dirty burner
Service burner.
(e)
Faulty Thermistor/Thermocouple
Replace if defective.
(f)
Dirty flueways.
Clean flueways
(g)
Dirty Oil Filter
Clean or replace
(h)
Worn nozzle
Replace nozzle
10.
Domestic Hot Water Rusty
Leak in indirect cylinder.
Replace cylinder.
Incorrect cylinder fitted.
Check with installer.
It is of the utmost importance to keep the flue pipe and chimney clear of deposits. Blocked or partially obstructed flueways and
chimneys will cause dangerous fumes to be emitted into the room, these may well be invisible.
