Troubleshooting; Fault Finding - EHC NEPTUNE NINDSL90L Installation & Maintenance Instructions Manual

15 EHC NEPTUNE
UNVENTED HOT WATER CYLINDERS
FAULT
Water escaping from the case
Cold water at hot taps
Water discharges from expansion
relief valve
Water discharges from temperature
& pressure relief valve
Milky / cloudy water
No hot water low
Noise during hot water draw-off
-typically worse in the morning
Hot or warm water from cold tap
SPARE PARTS
A full range of spare parts is available from Electric Heating
Company. Tel: 01698 820533 see page 2 for part numbers.
USER INSTRUCTIONS
Your system is automatic in normal use and requires only
annual servicing. You should employ a competent installer
to perform the annual servicing. Normally this is timed to
coincide with the annual boiler service.
IF WATER IS FLOWING FROM THE SAFETY VALVES
THROUGH THE TUNDISH THIS INDICATES A FAULT
CONDITION AND ACTION IS NEEDED.
If this water is hot, turn the boiler and / or the immersion
heater off. Do not turn off the water until the discharge runs
cool. The discharge may also stop.
CALL OUT A COMPETENT PLUMBER TO SERVICE THE

FAULT FINDING

POSSIBLE CAUSE
Compression itting on hot - draw off not sealing
Direct - immersion heater not switched on or cutout has
triggered
Indirect - boiler not working
Indirect - motorised valve fault
Indirect - cutout in dual stat has operated
If continual - pressure reducing valve ( part of inlet control set)
may not be operating correctly
If continual - expansion relief valve seat may be damaged
If intermittent - expansion vessel charge may have reduced /
bladder perished
Unit is being back pressurised
Unit has overheated - thermal controls have failed
Oxygenated water
Cold main off
Strainer blocked in pressure reducing valve
Inlet control set may be itted incorrectly
Loose airing cupboard pipework
If tap runs cold after a minute or so the pipe is picking up heat
from heating pipework.
SOLUTION
Check/remake joint with sealing paste
Check / reset
Check boiler - consult boiler manufacturers' instructions
Check plumbing / wiring to motorised valve
Reset and investigate cause
Check outlet pressure from inlet control set is 3 bar.
Remove cartridge - check seat and renew if necessary
Check pressure in expansion vessel. Recharge to 3 bar if
necessary. If bladder perished replace vessel.
With cylinder cold check pressure in cylinder. If this is the same
as the incoming mains pressure then you are getting backfeed.
Install a balanced cold supply (see page 5)
Switch off power to boiler and immersion heaters.
Leave water supply on. Wait until discharge stops.
Isolate water supply and replace if faulty
Water from any pressurised system will release oxygen bubbles
when lowing. The bubbles will settle out.
Check and open stopcock
Isolate water supply and clean
Check and reit as required
Install extra clips
Insulate / re-route
UNIT.
Tell them you have a fault on an unvented cylinder. We stock
all the spare parts they may need (see page 2).
DRAINING
IMPORTANT: After draining the cylinder do not close the
hot tap until the cylinder has fully cooled; failure to follow
this instruction may result in damage to the cylinder and
will invalidate the guarantee.