Page 18 of 24
Heat Pump Water Heaters
MWP Series
Troubleshooting
Water temperature varies significantly from its setting
• Unit may have been incorrectly sized for the pool.
• Unit may be in a protection or diagnostic failure mode
• Check the ow switch is not tripping in and out due to air in the
pipework
Unit does not seem to deliver the heating when most
needed
• Heating capacity at design conditions may be incorrect. As the
outside temperature falls, heat losses increase.
• Check the unit’s Specications for information on the
minimum/maximum operating temperatures.
For a new installation, why does it take some days
before the heat pump unit seems to work properly?
• Many new pools have a large amount of concrete and other
structural materials that are generally cold and full of moisture.
This is most evident in the winter when trying to heat the pool
water from scratch.
• Allow sufcient amount of time for unit to heat the pool. This
could be up to 60 hours. Start heating well before you need the
warmth most.
• Units need to be checked regularly to ensure proper operation
and that they are not exceeding operating limits for any length
of time.
Unit runs excessively – the pool temperature remains
too cold in winter.
• Keep doors and windows to indoor pool areas closed. This
area may require heating.
• Apply a pool cover on both indoor and outdoor pools. This will
reduce heat lose and also help keep the pool clean.
• Location of remote temperature sensor may be wrong. (The
standard location is at the base of the ThermoShell.)
• Check top air discharge is unblocked and air ow to the coil
face is clear and not restricted or blocked.
• Check no ice is forming on the coil between de-ice cycles
(Refer 7.10).
TZT-100 displays an error code or doesn’t operate as
expected.
Refer to page 26 for troubleshooting symptoms and faults.
Contact your Installer or Temperzone if problems persist.
Unit Controller (UC8) displays an error code
Refer to UC8 Controller label on the unit for operation & fault
diagnostics information; or visit www.temperzone.com and
model search ‘UC8 Controller’. Here you will also nd a ‘UC8
Troubleshooting Guide’.
Check the UC8 Controller dip switch settings match those on
the wiring diagram.
Unit Does Not Start
• Check there is water ow through the unit. The unit will not
start if the internal ow switch detects no water ow.
• Circuit breaker may have been tripped. Reset circuit breaker.
• Unit may be off or in wall thermostat mode. Check unit is
switched on at the unit, and external temperature controller is
in Heating mode.
• Unit may be in a protection or diagnostic failure mode. Check
for fault code display on unit’s controller board (refer also 6.5).
Water Dripping Outside
Condensation released during unit operation is normal.
If a condensate drain has been installed and it is connected to a
drain system:
• Check gaskets and ttings around drain for leaks and plugs.
• Check drain line is unblocked.
Note: If a threaded component ever needs to be removed or
replaced, use a suitable liquid pipe sealant (eg Locktite 567) to
prevent any joint leaks.
Ice or Frost Forms On Unit’s Coil
Under normal operation in cold conditions the coil will at times
change to a white appearance as a frost forms. The unit is
programmed to de-ice no more frequently than once every 50
min. At the end of each de-ice cycle, the coil should be
completely clear of ice. Should a layer of clear ice form on the
coil, then contact your Installer or Temperzone Customer
Service (www.temperzone.com).
WARRANTY & TECHNICAL SUPPORT
Please refer to the separate warranty document supplied with
the unit, or visit www.temperzone.biz for details.
Australia:
warranty@temperzone.com.au
spares@temperzone.com.au
Telephone: 1800 21 1800
New Zealand:
nztechnical support@temperzone.com
Telephone: 0800 TZWARRANTY (899 2777)
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