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Screen Display
B l o c k i n g E r r o r
R E F L O t o o L O
13 - TROUBLE SHOOTING
Control has blocking error for more than 20
hours in a row.
Three unsuccessful ignition attempts in a row
Open gas valve power circuit. May involve
high temperature switch, gas valve, or gas
valve relay in control module.
Safety Circuit is open.
Blower speed does not reach speed calculated
by Control Module.
Control Module internal error.
High Temperature opens during normal
operation.
Control Module detects flame after gas valve
is closed more than 10 seconds.
Flame is detected before gas valve opens.
Control module internal error.
Lost flame signal 3 times during one heat call.
Control Module internal error.
Control Module internal error.
External voltage supplied to DHW T-T or CH
T-T terminals. Eliminate voltage using dry
3
contact relay.
Flame detected when gas valve is closed.
Explanation
51
Go to Page For
Troubleshooting
Go to Page 53
Go to Page 54
Go to Page 53
Go to Page 55
Go to Page 56
Replace Control
Module
Go to Page 57
Replace Gas Valve
Replace Gas Valve
Replace Control
Module
Go to Page 58
Replace Control
Module
Replace Control
Module
-
Go to Page 58
PN 240011320 Rev. G 10/01/2021]
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