GLOW T180 - 6. Lock Out And Warnings; 6.1 Lockout Codes

Glow T180
Tankless Condensing Water Heater
56
6. Lock Out And Warnings
DO NOT PRESS RESET WHEN THE FOLLOWING CODES APPEAR.
FOLLOW THE INSTRUCTIONS AS FOUND IN THE RESOLUTION COLUMN
Lockout
Codes
Description Resolution
* Recycle power & press RESET
* If lockout code still exists, replace ICB (Ignition Control Board)
and display board
A01
Three unsuccessful attempts at ignition
ignition attempts in a row
* Follow instruction given in flowchart: A01 Ignition lockout
A02 Failure detected in gas valve circuit
* Verify electrical connections between gas valve and ICB
* Recycle power and press
RESET
* If lockout code still exists, replace ICB and display board
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.
* See BLOCKING ERROR on next page.
A05
Fan speed deviates for more than 60 seconds
A06
Fan runs too slow for more than 60 seconds
A07
Fan runs too fast for more than 60 seconds
A08
Internal software error
A11
Internal software error
A12
Internal software error
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
A18
Internal software error
A19
Internal software error
A20
Flame still present 10 seconds once gas valve
is de-energized
* Power OFF the unit and clean ionization electrode
* Recycle power and press
RESET
* Allow the burner to operate at high fire for 1 minute if A20 still
appears replace the ICB
* Recycle power and press RESET
A21 Flame is detected prior to ignition
* Power OFF the unit and clean ionization electrode
* Recycle power and press
RESET
* Allow the burner to operate at high fire for 1 minute if A20 still
appears replace the ICB
* Recycle power and press RESET
A22 Flame is lost 3 times during one demand
* Check intake & exhaust vent for obstructions and clear if any
* Check gas pressure at line pressure test port of gas valve. If
pressure fluctuates out of specified range, contact gas supplier.
* Check main power supply voltage, if voltage fluctuates out of
specified range, contact qualified electrician
* Power off the unit, clean ionizaton electode and secure its
connection to the ICB
* Check for blockage in condensate trap and heat exchanger. If
blockage exists, clean trap and or heat exchanger
* Recycle power and press RESET
* Verify electrical connections between fan and ICB
* Recycle power and press
RESET
* If lockout code still exists, replace ICB and display board
A00 Internal software error
* Recycle power and press
RESET
* If lockout code still exists, replace ICB and display board
* Recycle power and press
RESET
* If lockout code still exists, replace ICB and display board
Continued on next page