Facts

The facts Common system problems
Symptom: Cause:
FAILED PUMPS
Water flow stops and
radiators become cold
• Circulating sludge or other
debris
• Trapped air
RADIATOR FAILURE
The formation of a
‘pin-hole’ and consequent
leakage of water
• Corrosion due to flux
residues or other
contaminants
• Corrosion under settled
sludge
• Lack of inhibitor leading
to corrosion
RADIATOR COLD SPOTS
One or more radiators are
cold at the bottom yet
warm at the top
• Build-up of iron oxide
(magnetite) sludge
GASSING
Cold areas at the tops of
radiators needing
constant bleeding of
radiators
• Formation of hydrogen gas,
a product of corrosion
BOILER NOISE
Starts as kettling, then
develops into banging
noises heard throughout
the house
• Build-up of limescale
• Cirulating debris deposited
in the heat exchanger
INEFFICIENT BOILER
Extended boiler running
times to maintain room
temperatures and hot
water
• Accumulation of scale
deposits
• Presence of corrosion debris
• Build-up of sludge in
radiators affecting
circulation
LIMESCALE
Build-up of limescale
results is lost efficiency
and possible component
failure
• Heated hard water leaves
limescale deposit on the
heat exchanger