BeforecontactingRinnaiforservice,pleasefollowthefaultndingguide.Iftheproblempersistsorthisinformation
doesn’t answer your questions, contact Rinnai on the phone number on the back of this manual
Service call outs attending to any condition or fault that is not related to Rinnai product or components may be
chargeable�
INSUFFICIENT OR NO HOT WATER
Excessive hot water
consumption
Electric Boosted Systems:
Often people are surprised at the amount of hot water used, especially when
showering� If the amount of hot water used during the day exceeds the storage capacity
ofthecylinder,itislikelythattherewillbeinsufcienthotwater.
Gas Boosted Systems:
Insufcientowmayoccurifmultipleoutletsareinuseatthesametimeandexceed
theratedowcapacityofthegasbooster.Ifso,reducethenumberofoutletsinuse.
Considerdiscussingwithyourinstaller,ttingwatersavingxturesand/orowcontrol
or pressure limiting valves to reduce consumption�
Incorrect solar system size The system may not have been adequately sized to suit the household�
Temperature and pressure
relief valve / expansion
control valve discharging
water continuously
PTRValves&ECVValves(iftted)
It is normal and desirable that these valves allows a small quantity of water to be
discharged during the heating cycle� If they discharges more than a standard bucket
of water during a 24 hour period or discharges continuously there may be another
problem
If water continuously dribbles from the valve, try easing the valve gear for a few
seconds as described in the section ‘Maintenance and Regular Care’ on page 10�
This may dislodge any foreign matter and alleviate the problem�
Ifthevalvedischargesathighows,contactyourinstallerorRinnaitodiscuss.
Booster heating not
operating for electric
systems
Electric boosted Systems:
Check to ensure the electric isolating switch(es) at the switchboard (usually marked
“Hot water” or “water heater”) is switched ‘ON’�
Check to ensure that the electric fuses for hot water at the switchboard are intact
If running on Off-Peak, discuss boosting times with electricity supplier�
Boosterheatingnotoperatingorinsufcientgassupplyforgasboostedheatingsystem
Gas booster not operating
orinsufcientgassupply
for gas boosted heating
system
Gas Boosted Systems:
Check to ensure the power cord of the gas booster is plugged in and switched ‘on’�
Check gas is available and the isolation valve is opened
Close the hot tap and wait for 10 seconds and open it again� The hot tap must be
openedenoughtoensurethattheowrateissufcientforthegasboostertolight.
Check if there is gas supply to other appliances in the rest of the house
Booster thermostat settings Electric Boosted Systems:
Check the temperature of hot water delivered with a thermometer placed under the
closest outlet (usually the kitchen sink) on a non-tempered hot water line
This test should be done early in the morning after overnight electrical boosting before
any hot water is used� The temperature of the water delivered should be at least 55°C
(allowing for heat losses in pipe work)
If this is not the case or the temperature may need to be increased� Contact your
installerorRinnaitodiscussadjustingthethermostat.
NO WATER FROM THE HOT TAP
Restriction in the hot tap
or failure of the cold water
supply to the heater
Checkforwaterowattheotherhottapsandthatthecoldwaterisolationvalveisfully
open
Rinnai 11 CC OIM Issue 9
SAVE A SERVICE CALL