Installation and Operation Instructions Matrix
68
Symptom
Detected Problem
Solution
F
a
n Co
ntr
o
l (
B
lue F
a
ce
)
AL1
Communication Error with HRV
1.
Check wiring connections between HRV and Fan
Controller.
2.
Check door switch on HRV.
3.
Cycle power to appliance; contact NTI.
AL2
Plenum Temperature Limit of
160ºF Exceeded
1.
If plenum is hot, check operation of blower fan; contact
NTI.
2.
If plenum is not hot, check plenum sensor and wiring for
shorts or damage.
3.
Remove plenum sensor, PSO should be displayed, if so
replace plenum sensor, if not inspect wiring from
Terminal Strip to Fan Control. Replace Fan Control if
necessary.
AL5
“DHW Time-Out”
The Control has locked out DHW
due to the demand lasting longer
than 2.5 hours.
1.
Reset the AL5 error by resetting the power or cycling the
DHW call. Check for proper operation of the DHW call.
2.
Matrix units are provided with an integrated DHW flow
meter, if the control is registering a flow rate when the
water is turned off; disconnect the electrical lead to the
flow meter. If the indicated flow rate drops to 0, replace
flow meter, if not, replace fan controller.
3.
Ensure nothing is connected to the FS terminal of the
terminal strip (unless using a DHW tank aqua-stat to
trigger a demand – check operation of aqua-stat).
AL7
‘Boiler Control Error’
Fan controller has failed to
receive run status from Boiler
Control.
1.
Check for error code on Boiler Control.
2.
Check control wiring from Boiler Control to Fan Control
(Pins 17 and 18 on Fan Control – See wiring schematic in
Section 16.0).
AL8
(& Blower
Off)
‘Furnace Blower Error’
Blower has failed to meet a
minimum speed.
1.
Check for 120V to blower; ensure door switches are
making the circuit.
2.
Check wiring from Pin 6 at Fan Control (white wire) to
Pin 15 at blower motor.
3.
Check for 24VDC at blower Pin 15, if present replace
blower, if not replace Fan Control.
AL8
(& Blower
On)
‘Furnace Blower Error’
Control has failed to sense that
the blower has reached a
minimum speed.
1.
Check wiring from Pin 5 at Fan Control (black wire), to
Pin 16 at blower motor.
2.
Check for 3-5VDC at blower Pin 16, if present replace
blower, if not replace Fan Control.
F3.5
Flashing
Lack of 24 V at fan controller
1.
Check/Replace 2A fuse – blown fuse indicates 24V
supply shorted to ground, or excessive load.
F
enwa
l Ig
nitio
n Co
ntr
o
l
Two
Flashes on
Fenwal
The Fenwal controller thinks that
there is a flame prior to ignition.
Indicates Ignition Lockout.
If the combustion sequence is normal, and there is no flame
prior to ignition, the Fenwal control is defective, and must be
replaced.
Three
Flashes on
Fenwal
“Ignition Lockout”
If the condensate drain gets blocked, the boiler will become
flooded and terminate operation as the flame rod becomes
immersed. This will damage the flame probe. To correct, free
the drain blockage, and permanently prevent it from
reoccurring. Remove and dry off the probe. Reinstall the
probe and try for ignition, if it fails to stay lit, leave the fan
run for up to three hours to dry out the insulation and probe.
1.
Reset Boiler so it will attempt to ignite.
2.
Check for proper operation of ignition components.
Make sure igniter glows and gas valve opens.
3.
Check for proper line pressure at gas valve when it opens.
4.
If boiler lights check for flame signal between FC1 and
FC2 on Fenwal control (If lower than 1.2 DC µAmps see
“Boiler will not stay lit”).
5.
Check combustion properties.
