A.O. Smith BTH 199 - Igniter and Gas Pressure Tests

A. O. Smith Water Products Company Service Handbook
Irving, Texas 2000
©
Training Department
29
STEP 13. VOLTAGE TEST TO IGNITER. HSI PLUG MAY BE REMOVED.
Check for 120 VAC on the control circuit board - plug CN 5, term 1 to ground.
STEP 13A. ON BTH 250 MODELS ONLY.
Also check for 120 VAC on the blower speed board - CN 5 term 1 to ground.
(Blower should be at reduced RPM)
IF… THEN
120 VAC is not present replace
b
120 VAC is present continue
blower is not running or is at full RPM replace
b
blower is reduced RPM go to St
e
TROUBLESHOOTING
STEP 13 - VOLTAGE TEST ON 250 MODELS ONLY
STEP 13A - BLOWER SPEED CHECK ON 250 MODELS ONLY
STEP 13
STEP 13A
IF… THEN
120 VAC is not present replace control
b
120 VAC is present i
g
niter should b
e