NTI Matrix Installation And Operation Instructions Manual page 67

Matrix
Symptom
Control has sensed a lack of 24V
ER4 on the outlet of the burner relay
(B1). Lockout lasts for one hour
before automatically resetting.
Control has sensed a lack of 24V
ER6
to the gas valve during operation
or a Fenwal ignition lockout.
ER9
This is displayed when the boiler
is expecting the air switch to be
closed by a differential pressure
generated when the combustion
ASO
blower turns on. It can occur
Air Switch
momentarily during normal
Open
operation. A problem is indicated
This is displayed when the boiler
has turned the blower off and is
ASC expecting the air switch to be
Air Switch open. It can occur momentarily
Closed during normal operation. A
problem is indicated when ASC is
Excessive noise, current, or
Controller
voltage spikes in the 120V power
Locks-up
Display Goes No power to control or control
Blank
Detected Problem
"24V Limit Error"
"Flame Lock Out"
Internal Controller Fault
when ASO is displayed
continuously.
displayed continuously.
supply.
failure
Installation and Operation Instructions
Solution
1. Reset power, if error goes away the problem is
intermittent and was likely caused by a tripped limit that
has automatically reset, check for adequate water pressure
and flow rate. Allow the boiler to cycle and verify proper
operation including outlet water temperature and flue
temperature. If operation is unsuccessful and the error
reoccurs:
2. Matrix boilers are equipped with a low water pressure
switch on the boiler return that requires a minimum of
10PSI to complete the 24VAC ignition circuit. Ensure
the field-installed pressure gauge is reading a minimum of
12PSI. Replace water pressure switch if plumbing and
pressure is correct and if it measures an open circuit.
3. Check for continuity through the 24VAC limit wiring and
manifold and stack limits, replace limits or wiring that are
not a closed circuit.
There is a problem in the ignition sequence; it could be caused
by a faulty igniter, flame sensor, gas valve or improper line
pressure or combustion. Check ignition sequence to
determine which component is not functioning. (Control will
retry ignition sequence 1 hour after ER6 code originally
occurs or if control is reset)
Indicates that the Controller has lost communication with an
internal processor, contact NTI.
1. Ensure the vinyl tubes, connected between the air switch
and the ports on the inlet pipe, are in the proper locations.
Negative side of switch connects to the port on the 1-1/2"
PVC elbow.
2. Check for blockage on the intake and exhaust vents.
3. If fan is running the air switch may be faulty, ensure it is
set at 0.2"wc.
4. If fan is not running, check 120V wiring to blower, if ok
remove low voltage harness from blower, if blower fails
to start, replace blower, if blower does start the problem
may be with blower or Controller.
1. Does the combustion fan run continuously at full speed
while the error is displayed? If so check for 24V from
transformer, also check transformer fuse. If 24V is
present check the low voltage wiring from Controller to
combustion blower, replace Controller or Blower.
2. Is the combustion fan off? If so check for water in the air
switch and air switch tubes, replace switch if necessary.
3. Check venting termination with required venting
described in manual.
Contact NTI.
1. Check for 120V between terminals L1 and L2.
2. If 120V exists turn power off and remove line voltage
harness from Control. Then check for resistance between
L1 and L2 of control, if the circuit is open (O.L) the
internal fuse has blown. Check for shorts in wires leading
to circulator prior to replacing controller. (Note: If fuse is
good the circuit will read between 300 and 400 Ohms.)
3. If 120V not present, check wiring and for 120V at source.
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