Operating instructions

Part number 550-141-887/0800
38
AHE Series 4 Direct Vent Wall-Mounted Boilers — Boiler Manual
Troubleshooting — charts continued 12d
CHART 4 — PRES SWITCH & POWER lights flashing
Electrical shock hazard — Wherever you see ▲TURN OFF POWER▲, follow the instructions. Failure to follow
instructions could result in severe personal injury, death or substantial property damage.
Boiler should be in normal operating
sequence.
Observe operation until thermostat is
satisfied and blower has completed its post-
purge cycle.
• Remove one of the red wires connected to the pressure
switch.
• Check continuity across the switch terminals.
Does the ohmmeter indicate the switch is closed?
• Replace control module.
• Retest.
• Check air pressure switch per manual Section 12b,
page 33.
• Replace if necessary. Retest.
• Replace blower
motor. (Also check
blower housing
assembly. Replace
if necessary.)
• Retest.
• Properly position
blower wheel on
blower motor shaft
and tighten set
screw. (Or replace
blower housing
assembly.)
• Retest.
No Yes
Wait 45 seconds.
Does blower motor operate?
No Yes
• Remove BLOWER plug ( Figure 29, page 34, Item 3 )
from plug receptacle of control module.
• Place voltmeter leads across the 120 VAC N and
120 VAC H pins of the BLOWER receptacle.
Does the voltmeter indicate 120 VAC?
▲TURN OFF POWER▲ at service switch.
Does blower wheel turn freely by hand?
No Yes
No Yes
No Yes
Is blower wheel turning at speed of blower motor?
No Yes
Wait 5 minutes.
Is purge light flashing?
• Reset boiler control by turning off power at service switch or turning down thermostat for at least 45 seconds.
• Thermostat should call for heat and appropriate zone valves open.
Does blower motor operate?
▲TURN OFF POWER▲ at
service switch.
• Properly position blower
wheel on blower motor
shaft and tighten set
screw. (Or replace
blower housing
assembly.)
• Retest.
No Yes