Operating instructions

Part number 550-141-887/0800
40
AHE Series 4 Direct Vent Wall-Mounted Boilers — Boiler Manual
Troubleshooting — charts continued 12d
• Remove CIRCULATOR plug ( Figure 29, page 34, Item 4 )
from plug receptacle of control module.
• Place voltmeter leads across the 120 VAC N and
120 VAC H pins of the CIRCULATOR receptacle on the
side corresponding to the circulator not operating.
Does the voltmeter indicate 120 VAC?
CHART 6 — TSTAT CIRC light flashing and POWER light on steady
Electrical shock hazard — Wherever you see ▲TURN OFF POWER▲, follow the instructions. Failure to follow
instructions could result in severe personl injury, death or substantial property damage.
No Yes
• Replace control module.
• Retest.
• Test wire continuity of
circulator wire harness.
Is harness ok?
No Yes
• Replace circulator
harness.
• Retest.
• Reconnect circulator harness to control module.
• Attempt to get the circulator started by giving it a sharp rap
on the end of the circulator motor (to release a possibly
locked impeller).
• If the circulator begins to operate, allow it to operate for a
few minutes to see if the problem clears.
• If problem persists, replace the circulator.
• Retest.
No Yes
Is there a call for heat?
(Verify by removing thermostat wirings at boiler and checking
continuity across external wires)
• This is normal operation for
water less than 40 ˚F at
boiler internal return pipe.
• Condition should change
after a call for heat, when
the boiler will heat up the
water.
• Wait 10 minutes to allow
heat from the boiler to
raise the water
temperature.
Does LIMIT light quit
flashing (and pipes begin to
heat up)?
No Yes
• Boiler is not heating.
• Troubleshoot boiler using CHART 8.
• Boiler should now operate normally.
• Verify correct sequence of operation using Figure 17, page
22.
No Yes
Is boiler internal circulator operating?
CHART 7 — LIMIT light flashing and POWER light on steady
• This is not a lockout mode. The control module should only be signaling that the 47K resistor is shorted out.
• This situation is usually corrected by replacing the resistor, as described below.
Electrical shock hazard — Wherever you see ▲TURN OFF POWER▲, follow the instructions. Failure to follow
instructions could result in severe personl injury, death or substantial property damage.
• Remove RESISTOR plug from receptacle on the control module ( Figure 29, page 34, Item 6 ). Then re-insert.
Does LIMIT light still flash?
No Yes
No Yes
• Boiler may now be operating correctly. Verify per
normal sequnce of operation in Figure 17, page 22.
• Replace 47K resistor.
Does LIMIT light still flash?
• Replace control module.
• Retest.