Service manual

06/2010
5. Is unit changing between min burn and max burn? If yes, run AutoCal per SM500-15.
3.9 During a ‘Navy’ style shower water is cold for a short time
after turning off and then back on
1. When water flow is turned off the RV500 will also turn off. Turning the water on again will result
in a few seconds of over-heated water and then a few seconds of cold water. Our software
minimizes the duration of the cold water, but it takes about three seconds to sense the flow and
ignite the burner. The user can do the following:
 If you are not dry-camping enjoy your shower and let the water run. The RV500 is designed to
provide unlimited hot water.
 The micro-controller should be EL 9049-E or later.
3.10 Pressure relief valve leaks
1. Check water supply pressure
2. Briefly, open valve to clear any debris that might be lodged in the seat.
3. If the valve continues to leak, replace pressure relief valve 1375.
3.11 During the AutoCal procedure the unit shuts down and
restarts
Check T-out thermister as there may be a hot shift (typical problem found in production). Refer to the
section 4.5 ‘T-in, T-mid, T-out Thermister and T-set readout’.
Check flow rate by counting flashes from green light. Must be 0.5 gpm or greater. (refer to 4.3)
3.12 Exhaust contains dark smoke
1. While the heater is operating check the burner manifold for any indication of a gas leak. This is
observed as a localized, large flame or a flame located other than above the burner. All burners
must have a flame.
2. Check for obstructions in the heat exchanger, vent or air intake.
3. Shutdown the unit and contact a factory representative at [phone].
Section 4.
4.1 Cold water bypass