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Heat Pump Water Heaters
MWP Series
Operation Manual (cont’d)
Heat Pump Water Heaters
MWP Series
TZT-100
Padlock Symbol.
Whenever this symbol is shown, a control limit has been
reached, or a button, or other function has been locked
out.
Spanner Symbol.
If you see a spanner ICON ashing on your LCD, the
installer has left your thermostat in “Commissioning
mode” Although your thermostat will operate your
heating and cooling system whilst in “commissioning
mode”, all active safety and energy conservations
delays have been disabled. It is therefore HIGHLY
recommended that you contact your installer and
request that the installer mode be disabled.
Satellite Symbol
This indicates that your thermostat is receiving or
sending information to another “communicating”
controller, or a Building Management System.
Information received from the building supervisory
control system may change the function (mode or set
temperature) of the thermostat. This is normal and no
cause for concern.
The intent of this communications is to permit the
centralised control of building functions which can
include building climate control. To achieve this the BMS
must be able to override thermostat settings made by
the user. This ability is especially useful when a large
building, with multiple units, must be controlled.
TEXT “Locked”:
The temperature of the outside air can initiate, or prevent certain
functions within the thermostat from operating. If this happens,
the word “LOCKED” appears. These functions automatically
“unlock” once the outside air temperature becomes favourable.
TEXT “Hold”:
This indicates that the residential program is held (inactive) and
a permanent set temperature is enabled. This temperature can
be changed manually if desired however automatic time based
temperature changes are suspended.
TE XT “FAULT”
The TZT-100 has been “requested” to shut down the heating as
a response from an external command. This request may have
come from a sensor tted to the system, a sensor monitoring
supply power or a multitude of safety interlocks that can be
used. To clear this fault a service call to your service person
may be necessary.
For full product specications visit www.temperzone.biz;
model search ‘TZT-100’.
Troubleshooting
Symptom Suspected Fault Suggested Remedy
Temperature display seems
inaccurate
Sensor calibration setting may be incorrect Refer advanced Installer Manual p.19 for
information on how to calibrate the sensor.
Wall controller has no display Check the units mains power circuit breaker - Reset home circuit breaker. Call an approved
service agent.
- Faulty Wiring. Call an approved service agent.
Spanner Symbol in the LCD ashes
all the time
Installer has left the thermostat in ‘Commissioning mode’ Contact your installer and request
“Commissioning mode” be disabled.
Some buttons do not appear to
operate. Padlock is shown on LCD.
Key board lock is on. See full manual page 28 for more information
on this function. This is not a fault. Buttons or
functions may be locked to prevent
unauthorised tampering.
Cannot enter ‘Cool’ mode. This is not a fault. Not applicable to MWP application.
I cannot set my desired heating set
temperature.
Padlock Symbol is ashing This is not a fault. Your factory will have set
control limits for the Heating set temperature.
‘Heat’ is ashing in the LCD. Heating
has not started
This is not a fault. Heating will start shortly. The TZT-100 is performing an Anti Rapid Cycle
delay to conserve energy and to protect the
heating system.
Temperature display in the wrong
format – C or F
The TZT-100 can operate in either degrees Celsius or
Fahrenheit mode. This is set by your installer.
Contact your installer or Temperzone for
information on changing your display format.
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