Installation guide

37
Appendix D: Fault Finding
Symptom Cause Action
Strong odour Excess chemicals in the plant
Excessive laundry use
Carry out a settlement test
Drains inadequately venting
Nothing obvious can be found
Lack of aeration
See appendix E
See appendix E
See appendix C
Check that a high level vent is fitted to the
house and is working correctly
Carryout 12 month service and correct any
faults found
Check air pump
Air pump stopped Switched off at the mains isolator
Power failure
Switch on
Check the supply board for a trip or fuse.
Air pump is running but
no turbulence
Air pipe has been blocked or squashed or has a
problem such as the hose is split.
Inspect pipe and check all joints for any leaks
or splits.
Poor final effluent Check the compressor is operating and
delivering air to the bio-zone.
Carry out a settlement test
in Appendix C
Check and repair any faulty parts
Follow the fault finding guide in appendix E
Bio-zone chamber has
grey colour
Check there is good supply of air to the plant.
(turbulent pattern in Bio-zone)
Check that the air pump is operating correctly.
Bio-zone has greyish
to black colour and an
offensive odour
Excessive laundry use. 
laundry detergents.
Bio-zone has a very
light brown colour and
has few suspended
solids. White suds.
Lightly loaded. If plant has just started or the effluent quality
is OK no further action. Otherwise contact EPS
Bison for advice.
Check that no surface water
is entering the plant.
Bio-zone is black in
appearance
Plant is organically over-loaded
Not enough air is getting to the bio-zone.
Check load to plant or if a de-sludge is required.
Check air blower and air lines.
Grease balls in the
bio-zone.
Too much grease in effluent.
Excessive laundry use.
Reduce grease in kitchen waste.

Final effluent contains
many Solids.
Carry out 12 month service Only empty the plant of sludge if required.