Rinnai
9
HW Demand Duo Systems OIM
SAVE A SERVICE CALL
Check the items below before requesting a service. Service and parts charges may be incurred where it is found
that there is no fault with the water heater and the issue is related to the plumbing installation or is due to the failure
of water or electric supplies.
Insufficient or no hot water
Is the electricity supply
connected?
Check that the isolating switch marked “HOT WATER” or “WATER HEATER” at the
meter box is switched on. Check also that any isolating switches installed near the
water heater are switched on.
Check the fuse or circuit breaker marked “HOT WATER” or “WATER HEATER” at
the meter box. Repeated failure of fuse or tripping of circuit breaker indicates a fault
which must be investigated by an authorised trades person.
Is there insufficient gas
supply for gas heater(s)?
Check gas is available and turned ‘ON’.
Check the isolation valve in the gas line is opened.
Refer to your plumber to ensure the gas line has been purged of air after installation.
Are you using more hot
water than you think?
Often end users 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 of the hot water system, it is likely that there will be insufficient hot water.
Has your plumber install water saving fixture and/or flow control or pressure limiting
valves to reduce consumption.
Thermostat settings?
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.
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, the temperature may need to be increased. Contact your
installer or Rinnai to discuss adjusting the thermostat.
No water from the hot tap?
Restriction in the hot tap or failure of the cold water supply to the heater.
Check for water flow at the other hot taps and that the cold water isolation valve is
fully open.
Is the Primary Pump
operating correctly?
Check the controller screen information to verify the primary pump is operational
relative to the tank temperature set point. Use the maintenance function for the
controller to test the pump operation. Refer to separate manual for controller
functionality.
Is the controller showing
an error?
Refer to separate manual for the controller functionality.
Are the cold water filters
clean on the gas water
heater(s)?
Isolate and remove the water filter at the cold water connection point. Refer to
separate manual for the gas continuous flow water heater operation.
CARE & MAINTENANCE
