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AHE Series 4 Direct Vent Wall-Mounted Boilers — Boiler Manual
12a
Troubleshooting — procedure
Before troubleshooting
1.
Have the following items before troubleshooting
a.
b.
c.
d. Inclined manometer with 0-2" w.c. range.
2.
Check for 120 VAC (minimum 102 VAC to
maximum 132 VAC) to boiler.
3.
Make sure thermostat is calling for heat and
contacts (including appropriate zone controls) are
closed. Check for 24 VAC between thermostat wire
nuts and ground.
VERIFY PROPER OPERATION AFTER SERVICING.
32
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper
and dangerous operation.
Never jumper (bypass) rollout thermal fuse element or any other device except for momentary
testing as outlined in "Troubleshooting charts", found on pages 35-41. Severe personal injury,
death or substantial property damage can result.
Voltmeter that can check 120 VAC and 24 VAC.
Microammeter with a minimum scale range
of 0-25.
Continuity checker.
Check the following:
1.
Wire connectors to control module are securely
plugged in at module and originating control.
2.
Air pressure switch hoses are properly and securely
plugged in and are not damaged.
3.
Gas pressures:
a.
With boiler off:
•
13" w.c. maximum natural or propane gas
pressure upstream of gas valve.
b.
With boiler on:
•
5" w.c. natural gas pressure or 11" w.c.
propane gas pressure upstream of gas
valve.
•
3 ½" w.c. natural gas pressure or 10" w.c.
propane gas pressure downstream tapping
on gas valve (can be adjusted by regulator
on gas valve).
Part number 550-141-887/0800
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