Sanyo

[Abe]

I require help with a series of Sanyo Heat Pumps on R407C
Installed around 5 years ago.

Indoor Units are Ceiling Concealed Type and ducted to areas within space

Each outdoor unit is in the region 14Kw ( Approximate guess)

There are 5 outdoor units linked to 5 Indoor

Only 2 Controllers, I have been told 1 controller linked to 3 systems and 1 controller linked to 2 systems.

In heat mode both controllers display Error Code P4 simultaneously

Will appreciate some feedback

[Brian_UK]

Abe, try this Sanyo site...

http://www.sanyo.com/industrial/HVAC...productID=1284

I don't know if it is the correct model but you can download technical manual, about 11mb and other docs.

[s19652]

All p codes are for protective devices - but i cant remember which one P04 is. But its to go with the outdoor maybe a pressure switch.

can find out on monday for you

Best regards

[Cofreth]

P4 = High pressure switch is activated.
Check your refrigerant pressure, condenser fan and condenser coil cleaniness.

[Abe]

All p codes are for protective devices - but i cant remember which one P04 is. But its to go with the outdoor maybe a pressure switch.

can find out on monday for you

Best regards

Thank you, much appreciated

[Abe]

P4 = High pressure switch is activated.
Check your refrigerant pressure, condenser fan and condenser coil cleaniness.

The outdoor units were slung high up on a wall , and I could not get up to take readings, also was raining.

I started in cooling mode and from a visual point i saw all the fans were operating.

I then switched to Heat mode and thats when both controllers displayed P4

Using two controllers makes it more difficult which outdoor unit is at fault. I think the installer has daisy chained.

3 Outdoors on one controller, two on the other, however both controllers displayed P4 at same time.

[quiksilva]

From past experience ive always found oceanair very good in helping me out on sanyo splits - didnt realise just how deep you can go via the controllers into the operation of these units. I had something similar 6 months back which was
eventually traced to a dodgy discharge sensor which would initially run the fans at 100% then over the space of 4-5 minutes would drop them down to 0% Helpful!

[Electrocoolman]

Hi Abe,

Following info from Sanyo Tech man

Symptom: LCD on the remote controller displays “CHECK P04”. (High-pressure
switch activation warning)

If the system operates again:
High-pressure switch activation

(Both cooling and heating)
• Electronic refrigerant control valve
defect
• Refrigerant over-charged
(Cooling)
• Outdoor unit, heat exchanger dirty,
clogged
• Outdoor unit air short
• Outdoor fan stopped
(Heating)
• Outdoor unit air short
• Indoor unit, heat exchanger dirty,
clogged
• Large pipe side service valve
closed
• Indoor fan stop
• Air filter clogged

If the system does not operate again:
Are there connection defects in the wiring?
NO = HP switch defect, YES= Repair wiring!

[Electrocoolman]

Abe

If you PM me I'll email a pdf that has info....to big to attach here.

Adrian

[Electrocoolman]

Abe,
Got PM,
Email sent with pdf.

Adrian.