Specifications

54
stcudorP retaW htimS .O .A Service Workbook
Ashland City, Tennessee 2005© Training Department
TROUBLESHOOTING ERROR CODES
Error Code "04" Stage 1, 2, 3, or 4 - Indicates Insufficient Air (Air Pressure
Switch)
On Display Board red light is on "Insufficient Air" Red LED for indicated Stage - On
"Insufficient Air" relates to pressure at the Blower Prover (Differential) Switch
Display Window will show "LOCO 04?".
Power is "ON" - Plugs are in receptacles
Lockout
Status
If error code is …
… then

check air hoses.

adjust blower air shutter to on large blowers. Set blowers to
between 1.2 to 1.5" W.C.: for small blower (1000 only) set blower to
1.0 to 1.2" W.C.
041
042

check that hose connections are not reversed on Pressure Switch.
Burner hose should attach to rear Pressure Switch port. (marked

check for vent and exhaust len
g
th.

check for blocked intake or exhaust
044

check for 24 VAC on TB2 Terminal for Sta
g
e. (See dia
g
ram).

check negative pressure port of switch. Pressure should be
negative. If pressure exceeds + .05" check hose and connections
Soft
"04?" indicates Insufficient Air (Air Pressure Switch). Blower prover switch open. Closes at .70 W.C.
differential positive pressure. The last number in the code is the Stage (Ex. 041 = Stage 1)
043