Quote:
Originally Posted by GTX
Narrow it down to this part
It is either blocked or defective, still, very happy with the finding.
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That is probably the pressure switch that detects the proper airflow (suction) from the blower motor. It’s a typical safety switch in most tankless water heaters. When the blower is running the two wires should be shorted by the internal switch.
Verify that the wires to the switch are making good solid connections. Pull both of the connectors off the switch one at a time, the put them back, verify function in the next step.
Quick function check, disconnect the clear tubing. With the heater turned OFF suck gently on the end of the tubing. The switch should close, verified by a multimeter set to ohms across the disconnected switch terminals. The switch should not leak ‘lots’ of air, it should hold the suction., and stay closed.
Failing that, time for a new one.
__________________
Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
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