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Rinnai Boil & Brew: Owner and installer guide: 20830-B 02-17
Troubleshooting
Should a fault occur the table below should allow for most faults to be identified.
Problem
Possible cause
Action
Continuous steam
from vent pipe and
primary cutout
operates.
Control thermistor fault—open
circuit.
Scale build-up.
Check continuity (5 Kohmns at 100 °C, 100
Kohms at 25 °C).
Descale unit.
Drips from outlet.
Incorrect spring tension.
Scale—debris under tap seal.
Damaged tap seal.
Scale on tap outlet spout.
Ensure tap headwork nut is correctly adjusted.
Remove and clean.
Replace tap seal.
Clean tap outlet.
Water runs on
when tap released.
Scale on tap outlet spout.
Scale—debris under tap seal.
Damaged tap seal.
Clean tap outlet.
Remove and clean.
Replace tap seal.
No water coming
out
No water coming in through cold
inlet.
Check water is turned on.
Stale taste to
water.
Unit left unused for several days.
Empty and allow to refill before use.
Tap sticks open.
Dirt around handle pivot.
Clean with a stiff brush.
Unit does not heat
on commissioning
Element fault
Check element continuity and replace if faulty,
Water coming out
of overflow
Ballcock seal may have worn out.
Check seal and replace if necessary.
Water consistently
cooler than when
new.
Control thermistor pocket has a
covering of scale.
Control thermistor out of calibration.
Steam thermistor out of calibration.
Descale the pocket surface and unit.
Check continuity (5 Kohmns at 100 °C, 100
Kohms at 25 °C).
As above.
Uh-oh!
