CWH companion water heater — Product Manual
Troubleshooting
Preparation for troubleshooting
Documents needed
WM97+ Boiler manual
Mixing valve instruction manual
CWH Product manual
Get the latest boiler manual and CWH manual revisions from www.Weil-McLain.com.
Review all manuals before leaving for the jobsite.
Tools needed
Electrical meter to measure voltage and continuity.
Pressure gauge (such as Watts #276H300 test gauge).
Temperature gauge.
Stopwatch.
Bucket — 1 gallon or larger, with volume markings.
Suggested parts to have on hand.
Tank temperature sensors — see Replacement parts for part number.
Information needed before the service call
Boiler model number.
CP number.
Have the boiler manual and wiring and piping schematics readily available.
Troubleshooting procedures
Follow the troubleshooting guidelines step by step. Always double-check your results.
Skipping or not completing steps can lead to wrong conclusions, repeated callbacks to the
jobsite and unhappy customers.
Part number 635-500-156/0113
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