w w w . i n n o v a i r . c o m
DELUXE
Inverter
Service
M
anual
（
15
）
F7-OVP or UVP error
Explanation of
error
Cause:
All the inverter air conditioners are equipped with voltage inspection circuits
but differ
e
nt models of machines have differ
e
nt locations for the voltage inspection
(on the modu
l
e panel or main external control panel). When the supply voltage is lower
than 135V or higher than 275V, the inspectio
n
circuit would detect over or under
voltage protection signal and send it to the main external control panel and the main
external control panel would raise the alarm "OVP or UVP error" and indicate it
through the internal motor.
Inspection path: supply voltage → internal direct current voltage → reactor wiring →
module panel → main external control panel.
Tools required
for inspection
Multimeter
Frequent
problematic part
Supply voltage, reactor, modu
l
e panel and main external control panel.
Inspection
procedure and
key points
1. First, check the supply environment of the user, especially check when the
compressor of the air conditioner has been running for a while. The normal supply
voltage sh
ould
be between 198V and 242V and the minimum work assurance range of
the air conditioner s
hould
be within 165V and 265V
. N
ot
e
that
the voltage value
sh
ou
l
d
not decrease significantly after running the compressor
(voltage decreasing by
over 25V)
. I
f the supply voltage is decreased by a lot,
it means the supply line capacity
is insufficient and
it
is suggested to
replace the circuit or install a speci
a
li
z
ed air
conditioner supply voltage stabilizer.
2. For the external machines with PFC panels (without separate rectifier bridges), the
operator sh
ould check that
the PFC function is on with the direct current voltage grade
of
the multimeter. When the compressor is running, voltage between P and N ends
detected on the test module panel or main external control panel sh
ould
be over 200V
and
if the voltage is below that range
there
is
a
possib
ility of a faulty
reactor or the
PFC is
broken.
3. When the air conditioner is switched on, if the compressor is not running but there is
a
n
alarm of "OVP or UVP error" and the power voltage detected with the multimeter is
not below 150V, it's probabl
e
the voltage inspection circuit is fault
y
. The operator
shall
check and
first
confirm
in which control panel
the voltage inspection circuit is
on and then
replace it. The regular replacement: for the external machine of single
panel single chip,
replace the external controller directly; and for the machine of two
panels, replace the
module panel.
Special attention
For some models, OVP or UVP error signal is delivered through the connector wires
between the module panel and the main external control panel
. I
t is possible the
voltage signal is not delivered
if
the communication between t
h
e module pan
e
l and
the main external control panel is not good.
P
ossibl
y
the error is
a false alarm,
but
after some minutes that the error is finally confirmed as "Main external control panel
and module panel communication error", which shall be specially noted.
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