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Old 05-21-2023, 11:35 AM   #1
GTX
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2018 Tommy Bahama Interstate
Toronto , Ontario
Join Date: May 2023
Posts: 4
Interstate 2018 water heater working no hot water.

I am having some strange issues with the water heater:
- The propane is on, checked the stove.
- The electricity is on, checked the water heater.
- Water pump on, there is water going to the heater.
- There is propane.

When I switch the hot water on:
- The water heater exhaust fan starts.
- There is either no propane flowing to the heater or no ignition or something else.

Water flowing, heater exhaust fan on, no hot water

I searched the internet a lot, but not much help, need your help.
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Old 05-21-2023, 07:41 PM   #2
GTX
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2018 Tommy Bahama Interstate
Toronto , Ontario
Join Date: May 2023
Posts: 4
Narrow it down to this part

It is either blocked or defective, still, very happy with the finding.
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Old 05-21-2023, 08:21 PM   #3
Rivet Master
 
2007 22' International CCD
Corona , California
Join Date: Jul 2013
Posts: 9,180
Quote:
Originally Posted by GTX View Post
Narrow it down to this part



It is either blocked or defective, still, very happy with the finding.


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.
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