18 | nVent.com
Error
no.
Warning
message
Problem causes
Corrective actions
E:3.2
bOilEr TEmp
HigH
Water heater
temperature too high
Will pop up if
Temperature sensor
is higher than the
maximum exposure
temperature of the
Hwat cable: Hwat-M
(65°C), HWAT-r (85°C)
Check sensor and boiler
temperature
E:4.1
bOilEr TEmp
lOW
Water heater
temperature is lower
than maintain
temperature set point
of the HWAT-ECO
Check water heater
temperature (also indicated
in inFO of HWAT-ECO
menu)Check maintain
temperature setting at
HWAT-ECO. Check
temperature sensor
mounting
E:4.2
pipE TEmp lOW
Water heater
temperature is lower
than maintain
temperature set point
of the HWAT-ECO
Check water heater
temperature (also indicated
in inFO of HWAT-ECO
menu). Check maintain
temperature setting at
HWAT-ECO. Check
temperature sensor
mounting
E:5
HEATing CAblE
disCOnnECT
low or no current alarm
no current measured
when the circuit should
be on.
confirm that heating
cable is connected to the
controller.
E:6.x
inTErnAl ErrOr
internal Error
disconnect HWAT-ECO
controller and replace unit.
E:7
plAUsibiliTy
CHECk
Check parameter settings
E:8
Time and
AnnUAl TimE
VEriFiCATiOn
no power supplied
during prolonged period
of time (~30 days).
Clock reset to default
“01.01.2001 00:00”
displays
set date and time.
Water
temperature too
low
water heating cable
temperature is too low
installed heating
cable is different
from the programme
selected insulation
thickness deviates from
the required insulation
thickness.the ambient
temperature value
entered is too high
Check water heater
temperature and timer
programme.
change heating cable
type in
HWAT-ECO
(can only be done
in quick start).
see 3.1.3.
Adjust power correction
factor. see 3.3.1.4.
change value of ambient
temperature.
see 3.1.5.
Water
temperature too
high
water heating cable
temperature is too
high insulation
thickness deviates
from the required
insulationthickness
the ambient
temperature value
entered is too low
change heating cable
type in
HWAT-ECO
(can only be done
in quick start).
see 3.1.3.
Adjust power correction
factor. see 3.1.4.
change value of ambient
temperature.
see 3.1.5.
Cannot access
programming
mode and
parameter
settings
Controller is
password protected
Enter your 4-digit
password.if you forgot your
password, enter the backup
password (3000) to unlock
the controller. see key lock
