Fault Finding - Heatrae Sadia Megaflo Eco SolaReady Instructions Manual

Fault finding:

FAILURES WITH ERROR MESSAGE
Some system failure modes can be recognised by the solar differential
temperature controller and will be indicated by an error message on the
controller display. Refer to the table below for details of possible errors
and suggested measures to rectify.
NOTE: These error messages wil automatically reset when the fault has
been rectified. In the case of the circulation error this may take a few
minutes to clear once normal flow has resumed.
Error displayed Possible
X
on-screen causes
Disruption to
sensor cable
Sensor defective
!
flashing
Short-circuit in
X
sensor cable
!
Sensor defective
flashing
Circulation fault: Fault in pump
no flow-through connection
Pump defective
+ !
Air in the system
flashing
Flow meter
defective
Also displayed Grundfos sensor
with energy yield
defective
X
measurement:
Connection
to flow meter
defective
Disruption to
sensor cable
Sensor defective
Resistance table PT1000.
The correct function of temperature sensros can be checked on the basis
of the following temperature resistance table with a resistance measuring
instrument:
Temperature Resistance in
in ºC Ohm
-30 882
-20 921
-10 960
0 1000
10 1039
20 1077
30 1116
40 1155
50 1194
Actions to take
Check cable
Check sensor resistance,
replace sensor if necessary
Check cable
Check sensor resistance
replace if necessary
Check cabling
Replace pump
Vent system
If visible, check whether the
flywheel of the meter moves
when the system is running
Check VFS sensor.
Measured voltage at
terminal should be
between 0.5 and 3.5V DC
Check cable
Check cable
Check sensor resistance,
replace sensor if necessary
Temperature Resistance in
in ºC Ohm
60 1232
70 1271
80 1309
90 1347
100 1385
120 1461
140 1535
200 1758
FAILURES WITHOUT ERROR MESSAGES
For faults and malfunctions that cannot be displayed, you can use
the following table to identify them, plus evaluate the possible causes
and sources of such erors. If you cannot rectify the fault by using the
description below, you will need to contact your supplier or installer.
IMPORTANT: Any faults involving the 230V/AC mains power supply must
only be rectified by a technician.
Error display Possible causes
No possible 230V mains power
display supply unavailable
!
Fuse inside unit
defective
Unit defective
Outputs are not
Unit is in manual
switched on operation mode
Switch-on condition
not yet achieve
"Pump" icon Disruption to pump
turns, but pump connection
is not on
Pump has seized up
!
Switched output has
no current
Temperature Sensor cabling has
display fluctuates been laid near to
strongly at short 230V cables
intervals
Long sensor cables
extended using
unshielded leads
Unit defective
Actions to take
Switch on or connect up
control unit
Check fuses for building
power supply
Check fuse*, replace if
necessary with new 2A
(T) fuse.
Check 230V compo-
nents for short-circuits
Contact your supplier
Exit "Manual Operation"
menu
Wait until switch-on
condition achieved
Check cable to pump
Ensure pump can run
smoothly
Contact your supplier
Reposition sensor
cabling, shield sensor
leads
Shield sensor leads
Contact your supplier
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