GLOW T-150, Installation & Operation Manual

Page: 56 / 88

Glow T150 & T180
Tankless Condensing Water Heater
56
6. Lockout Codes And Blocking Errors
6.1 Lockout Error
A lockout is indicated when “A” is displayed on the screen followed by a 2-digit number. Do not press RESET when
the following codes appear. Follow the instructions as found in the resolution column below..
Continued on next page
Code Description Resolution
A00 Internal software error
* Recycle power & press
RESET
* If lockout code still exists, replace ICB (Ignition Control Board)
and display board
A01 Three unsuccessful ignition attempts
in a row
* Follow instruction given in flowchart:
A01
Ignition lockout
A02 Failure detected in gas valve circuit
* Turn off the unit and verify electrical connections between gas
valve and ICB.
* Check for power at line, neutral and ground connections in the
wiring leading to unit. Check the internal ground connections
within unit.
* If connections are ok while making sure the power is “OFF”,
remove Molex connector “J12” from the ICB.
* Turn ON the power, If unit still shows “A02” replace ICB or
follow next step
* Make sure power is OFF replug Molex connector “J12” back
to ICB
* Turn “ON” power and press RESET
* If lockout code still exists, replace Gas valve
A03 Failure detected in safety circuit
within ICB
* Verify electrical connections between safety switches (Hi-limit,
blocked flue switch), and all sensors and ICB
* Recycle power and press
RESET
* If lockout code still exists, replace ICB and display board
A04 ICB has a BLOCKING ERROR for
more than 20 hours.
* Press RESET, the BLOCKING ERROR will appear
* If blocking error disappear, See parameter 1.052 to identify
the last Blocking error
* See BLOCKING ERROR cause and resolution on next page
A05
Fan speed deviates for more than 60
seconds
* Verify wiring harness and electrical connections between fan
and ICB
* Verify Exhaust and intake vent free from obstacles
* Recycle power and press RESET
* If lockout code still exists, replace ICB
A06
A07
A08
Internal software error
* Recycle power and press
RESET
* If lockout code still exists, replace ICB and display board
A11
A12
A15 Hi-Limit switch or micro fuse is open
* Follow instruction given in flowchart:
A15
Hi-limit switch open
or microfuse open
A16
Flue temperature exceeded
the maximum flue temperature
(65°C/150°F)
* Follow instruction given in flowchart:
A16
Flue gas
temperature exceeds limit (65°C/150°F)
A17
Internal software error
* Recycle power and press
RESET
* If lockout code still exists, replace ICB and display board
A18
A19
A20 Flame still present 10 seconds once
gas valve is de-energized
* Power OFF the unit and clean ionization electrode. Verify the
wiring harness and connections of gas valve to ICB
* Check intake & exhaust vent for obstructions
* Recycle power and press RESET
* Measured CO2 % at High fire and low fire with combustion
analyzer. Adjust CO2 % if the values are out of specified range