Watts Aerco Modulex MLX EXT 1530 - E8 Controller Fault Codes

Modulex EXT Commercial Series Boilers User Manual
CHAPTER 7: Troubleshooting
OMM-0095_0H AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 111 of 144
GF-139 Phone: 800-526-0288 09/15/2017
7.1.1 E8 Controller Fault Codes
The table below lists the fault codes and fault descriptions associated with the E8 Controller.
TABLE 7-2: E8 Controller Fault Codes
CODE DESCRIPTION EFFECT CORRECTION RESET
PCB Element Fault
E 1
Intervention of the
high limit thermostat
(TL).
Boiler shuts off.
Check for any obstructions
in the piping. Ensure
sufficient flow.
MANUAL - Pushbutton
under cap, located to the
left of the E8 controller.
E 2
Insufficient gas
pressure.
Boiler will not run.
Check gas supply to the
unit and ensure minimum
3.5" w.c. at high fire
AUTOMATIC
E 4
No flame detected
during the ignition
phase.
Boiler will not remain
lit after 3 attempts.
Watch ignition through
viewport. Ensure correct
120V wiring to the unit.
Clean or replace flame rod.
MANUAL - Clear fault and
retry ignition.
E 5
Loss of flame signal
during boiler
operation.
Boiler fails after
establishing flame
Ensure sufficient gas
pressure and flow during
high fire operation and
with any other connected
gas equpiment running.
Check and clean flame rod.
AUTOMATIC - Clear fault
and retry ignition.
E 6
Over high water
temperature detected
by the heating sensor
(SR) (>203°F).
Boiler shuts off.
Check for any obstructions
in the piping. Ensure
sufficient flow.
AUTOMATIC - After
temperature falls.
E 10
Internal failure of the
local control PCB
(BMM).
Module shuts off.
Shut off power to the
boiler. Check fuse on
BMM. Replace BMM if
necessary.
AUTOMATIC - After turning
power on to the unit.
E 11
Flame signal detected
before the ignition
cycle.
Boiler will not
attempt ignition.
Allow flame rod to cool.
Possibly replace flame rod.
MANUAL - Clear fault and
retry ignition.
E 12
Local flow sensor
failure SR1 first
module.
Module will not run.
Check with multimeter and
replace if necessary.
AUTOMATIC
E 14
Failure of the heating
return sensor (SRR).
Module will not run.
Check with multimeter and
replace if necessary.
AUTOMATIC
E 15
Difference between
the global return
heating temperature
global sensor and the
heating flow sensor
greater than (>) 86 °F
(rp +10).
Boiler shuts off and
pump turns on at max
speed.
Check for any obstructions
in the piping. Ensure
sufficient flow.
AUTOMATIC - When ΔT <
protection temperature