iStore - Installation Manual - June 2020
31
PROBLEM
SOURCE
EXPLANATION
Water not as hot as
previous hot water system
Tempering Valve installed
A tempering valve must be
installed on every solar hot water system.
Tempering valves will mix water down to 50°C.
No Power at Screen
Circuit breaker turned off
AC Isolator Turned Off
Power surge
Check Circuit breaker in meter box
Check AC Isolator in on position
Contact iStore
No Hot Water - 1
Faulty Tempering Valve
Pull PTR lever and check if water is hot. If water
is hot, contact a licensed plumber to replace
tempering valve.
No Hot Water – 2
Off-Peak Tariff
Check screen to see if power is available during
your nominated off-peak tariff heating times.
Refer to your electricity distributor should power
not be available from off-peak supply
No Hot Water – 3
Timer not set correctly
Ensure that timer is set to heat to your hot water
demands. A secondary heating cycle maybe
required if large hot water demand is used
twice per day. Refer above instructions for timer
settings
Luke Warm Hot Water - 1
Tempering Valve
Tempering valve not mixing water correctly.
Contact a licensed plumber to inspect / replace
the valve
Luke Warm Hot Water – 2
Excessive Hot Water load
Unexpected additional hot water load. Plan hot
water usage to be staggered, not continuous
consumption. Wait for system to re-heat.
Increase timer setting if in use. Utilise hybrid
mode to decrease re-heating time.
Overflow pipe is dripping
Pressure Temperature
Relief Valve (PTR) / Expan-
sion Control Valve (ECV)
where applicable.
An 850kPa and 99°C PTR valve is used on the
iStore water tank, which is located on the side
of the water tank and is essential for its safe
operation. The PTR valve is designed to allow
3-5% of total tank volume to discharge during
heating to allow for hot water expansion.
Water pressure is slightly
lower than previous hot
water system
Pressure Reduction Valve
(PRV)
A pressure reduction valve has been installed
to limit the inlet pressure to your new iStore
Water Heater. This device regulates the incoming
pressure & increases life of the cylinder. This
device will also protect your cylinder if the
mains pressure is increased by the local water
authority.
Trouble Shooting
