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67Part number 550-141-850/0699
• Installation • Start-Up • Parts • Maintenance
Troubleshooting — proceduresXIb
Label all wires prior to disconnection when servicing controls. Wiring
errors can cause improper and dangerous operation.
Never jumper (bypass) any device except for momentary testing as
outlined in Troubleshooting charts. Severe personal injury, death or
substantial property damage can result.
Before troubleshooting:
1. Have a voltmeter that can check 120 VAC and 24 VAC and a continuity
checker.
2. Check for 120 VAC (min. 102-max.132) 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.
4. Have an inclined manometer with 0 – 2" w.c. range.
Check the following:
1. Wire connectors to control module are securely plugged in at module
and originating control.
2. Hoses are properly and securely plugged in and are not damaged.
The control module and boiler controls can malfunction if they get wet.
Never try to use a control that has been flooded or wet. Replace it. Failure to
comply can result in severe personal injury, death or substantial property
damage.
VERIFY PROPER OPERAVERIFY PROPER OPERA
VERIFY PROPER OPERAVERIFY PROPER OPERA
VERIFY PROPER OPERA
TION AFTER SERTION AFTER SER
TION AFTER SERTION AFTER SER
TION AFTER SER
VICING.VICING.
VICING.VICING.
VICING.