Mitsubishi Electric Ecodan PUHZ-W50VHA-BS Troubleshooting guide

This guide has been produced in additional to the main home owner manuals. It will enable the end-user to quickly understand and
set-up the main functions of the unit. The Ecodan® unit is an air-source heat pump it is a highly efficient way of providing heating
and hot water for your home.
Although two modes are available with the Ecodan® unit space heating and hot water), the hot water demand will always be met
first. The need for both services will vary from one home to another.
Thermostats and timers are used for timing purposes and supplied by the installer, they work in conjunction with the Mitsubishi
PAR-W21MAA controller. This is used for setting up the heating parameters during commissioning. The diagrams below show the
display features and keypad operation. Please note not all display features and buttons are used within this quick reference guide as
this is just used as a base to work from. For further explanation please refer to the main homeowners guide.
Ecodan® Air Source Heat Pump
Quick Start-up Guide
PUHZ-W50VHA-BS
PUHZ-W85VHA-BS
PUHZ-HW140VHA-BS / YHA-BS
F Set Temperature buttons
G Timer Menu button
Monitor/ Set button)
E Mode buttons Return button)
C Set Time button
D Timer On Off
button
I ON OFF button
H Setting change button
A CIR.WATER button
Enter button)
B not available
J Self check (clear) button
Test run function is not available with this FTC unit
2 Identifies the current operation
Shows the operating mode, etc.
* Multi language display is supported.
5 “Centrally Centralised” indicator
Indicates that operation of the remote
controller has been prohibited by a master
controller.
6 “Timer is Off” indicator
Indicates that the timer is off.
3 Temperature Setting
Shows the target temperature
1 Day of the Week
Shows the current day of the week
Time Timer Display
Shows the current time, unless the simple
or Auto Off timer is set.
If the simple or Auto Off timer is set, 7 ON OFF indicator
Indicates if the time is set ON/OFF
8 “Locked” indicator
Indicates that remote controller buttons
have been locked.
9 Timer indicators
The indicator comes on if the correspond-
ing timer is set.
10 Error indicator
Comes on when error occurs.
4 Temperature indicator
Shows the current water temperature
11 Power On indicator
Indicates that the power is on.
For purposes of this explanation, all parts of the display are shown. During the actual
operation, only the relevant items will be displayed.

Change Language
The initial language setting is English. If you require to change this follow the 4 steps below. The instructions in this guide
use English for the annotated displays, whatever language is selected the combination of buttons will not alter.
Step 1:
Hold down buttons D and E for 2 seconds.
This activates the controller
Step 2:
Press button G. To scroll through the lan-
guages
1
2
3
Normal Display
Change Language
D E
G
Language
English GB)
Language
Spräk VAL
Language
Deutsch D)
Language
French F)
Language
Espanol E)
Language
Pycck RU)
Language
Italiano I)
Step 3:
For each press of button G will move
through the 7 available languages. Leave on
desired language to proceed.
G G G
G
G
G
G
4 Normal Display
D E Step 4:
Hold down buttons D and E for 2 seconds.
To return to original screen.
2
1 Normal Display
C
Mon Tue Sun Wed Thu Fri Sat
Time
Step 1:
Press either of the C buttons
to start
Step 2:
Press button D to advance
through each day. Once on
current day press C to set
time.
Step 3:
Press either of the C buttons
as necessary to set the time.
3
To finish:
Press button E when settings
are complete.
As you hold the C button down, the time displayed at 1) will increment first in one minute intervals, then in ten minute
intervals, and then in one hour intervals. This works in either direction.
Note:
“PLEASE WAIT” message
This message is displayed for approximately 3 minutes when power is supplied to the FTC unit or when the unit is recov-
ering from a power failure
“NOT AVAILABLE” message
This message is displayed if a button is pressed to operate a function that the FTC unit does not have, or a function that
is not available due to the setting.
Setting day of the week and time
Unlike having a default language, the day and time will run from the day the system is switched on. To change these set-
tings please following instructions.
Throughout this guide the buttons on the controller are referenced by letters and displays by numbers ; this key can be found on the first page

When setting up the controller, pressing button A must be used to memorise these settings.
Once the ‘heating eco’ mode is activated the parameters need to be chosen. The recommended temperatures are listed
on the following page.
Heating Set-up (Heating Eco Mode)
Whilst heating a property the ‘eco heating’ is the recommended mode to use; this setting is a heating function with weather com-
pensation. This function sets the target temperature depending on the outdoor temperature. The buttons on the controller are
represented by letters explained on the first page.
When setting up the controller, pressing button A must be used to
memorize the settings.
Once these have been set-up, likewise with the heating a temperature
needs to be set-up, these instructions are on the following page.
Heating Parameters
The weather compensation feature allows for higher temperatures to
be achieved when the outdoor temperature is warmer.
FLOW TEMP.
OUTDOOR
TEMP.
A
B
No.1
No.2
No. 1 No.2
What is on the screen Flashing Temp. represents Keypad selection Notes
1. Normal mode Hold down H for
3 seconds
This activates the controller, the display will flash
with the words ‘loading’
2. Water Temp Heating Press E This mode is not necessary and should be skipped
3. Water Temp Eco Heating No.1 Low Ambient Target Flow Press F Move up or down to desired temperature. Low
ambient flow/ temperature is denoted by No.1
4. Water Temp Eco Heating No.1 Low Ambient Target Flow Press D Changes to next temperature variable
5. Water Temp Eco Heating No.1 Low Ambient Outdoor Temperature Press F Move up or down to desired temperature
6. Water Temp Eco Heating No.1 Low Ambient Outdoor Temperature Press E Changes to next temperature variable
7. Water Temp Eco Heating No.2 High Ambient Target Flow Press F Move up or down to desired temperature. High
ambient flow/ temperature is denoted by No.2
8. Water Temp Eco Heating No.2 High Ambient Target Flow Press D Changes to next temperature variable
9. Water Temp Eco Heating No.2 High Ambient Outdoor Temperature Press F Move up or down to desire temperature
10. Water Temp Eco Heating No.2 High Ambient Outdoor Temperature Press A
11. Water Temp Eco Heating No.2 High Ambient Outdoor Temperature Hold down E This will end the parameters that need to be set.
Pressing D will return to step 3.
This must be pressed to memorise these settings.
The screen will flash ’settings’ for several seconds
Throughout this guide the buttons on the controller are referenced by letters and displays by numbers ; this key can be found on the first page

Recommended Settings
The controller has settings pre-installed that will provide adequate hot water and heating, but they can be amended using
the instructions in the first two sections. The temperatures that should be used are as follows
Lower flow temperatures lead to greater efficiencies.
Radiators
Please note that heat pumps provide lower flow temperatures to radiators than a conventional gas boiler. Rather the
radiators turning on/off locally as with a gas boiler, heat pumps provide a more consistent lower flow temperature which
allows for more efficiency and greater comfort.
Hot Water Set-up
The recommended temperatures as stated above) need to be programmed into the controller
What is on the screen Flashing Temp. represents Keypad selection Notes
1. Normal mode Hold down H
for 3 seconds
This activates the controller, the display will flash
with the words ‘loading’
2. Water Temp Heating Press E This mode is not necessary and should be skipped
3. Water Temp Heating Eco No.1 Press E This mode is not necessary and should be skipped
4. Water Temp Heating Eco No.2 Press E This mode is not necessary and should be skipped
5. Water Temp Hot Water Water Temp Hot Water Press D Move up or down to desired temperature
6. Water Temp Hot Water Water Temp Hot Water Press A
7. Water Temp Hot Water Water Temp Hot Water Hold down H This will end the parameters that need to be set.
Pressing button I ON/OFF) will also end the set-up.
Once pressed it will memorise these settings. The
screen will flash ‘settings’ for several seconds.
PAR-W21MAA recommended flow temperatures Factory Settings Recommended
Hot Water
50 ° C 58 ° C
Eco Heating Low Ambient Temperature Under-floor
-10°C ~ 38°C
-2°C ~ 40°C
Radiator -2°C ~ 45°C
High Ambient Temperature Under-floor
17°C ~ 25°C
15°C ~ 30°C
Radiator 15°C ~ 30°C
Throughout this guide the buttons on the controller are referenced by letters and displays by numbers ; this key can be found on the front page