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11-15-2020, 10:43 PM
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#1
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Senior Member
Brand: Thor Motor Coach
Model: challenger 37FH
State: Delaware
Posts: 695
THOR #13399
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Tankless Girard can't lower temp
2019 Thor Challenger Girard tankless water heater has been working great for 14months fulltime,suddenly I set my temp at 98degrees but water goes to 110 or higher and won't go any lower then 110 even when set to 96,doesn't make any difference on city or water pump or both together .
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11-15-2020, 11:25 PM
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#2
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Senior Member
Brand: Thor Motor Coach
Model: 2020 Magnitude SV34
State: Florida
Posts: 4,152
THOR #12751
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Where are you camping? If you are in a very warm climate where the city water temperature is very warm, it can overshoot the set temperature.
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11-16-2020, 01:22 AM
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#3
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Senior Member
Brand: Thor Motor Coach
Model: challenger 37FH
State: Delaware
Posts: 695
THOR #13399
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We're in key west yes it's hot but this started Wednesday using freshwater tank and pump, now on city water same problem,only change is propane tank down to 1/4 tank first time below 1/2 tank ,don't think that should make a difference, but?
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11-16-2020, 02:16 AM
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#4
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Senior Member
Brand: Thor Motor Coach
Model: 2020 Magnitude SV34
State: Florida
Posts: 4,152
THOR #12751
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This is all I can find in the service manual. Most temperature control problems should result on an Error Code on the control panel that will have an "E" followed by a number.
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11-16-2020, 12:59 PM
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#5
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Senior Member
Brand: Thor Motor Coach
Model: challenger 37FH
State: Delaware
Posts: 695
THOR #13399
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I've checked everything twice,it must be the warmer input water. It's not a big deal just looking for any solution if you mix to much cold water in the heater shuts off. thanks for the help.
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11-16-2020, 02:50 PM
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#6
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Senior Member
Brand: Thor Motor Coach
Model: 2020 Magnitude SV34
State: Florida
Posts: 4,152
THOR #12751
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Quote:
Originally Posted by wrapped
I've checked everything twice,it must be the warmer input water. It's not a big deal just looking for any solution if you mix to much cold water in the heater shuts off. thanks for the help.
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I'm fairly convinced it is the temperature of your incoming water supply.
I'm in Cape Coral, FL and the Gulf water temp is 78 degrees. Day time highs have been in the 80's and night time lows in the 70's so it stands to reason your fresh water tank and probably the city water supply is in the mid to upper 70's. It is going to take very little to heat that incoming water.
I can turn my hot water tank off in my home if I am not here for a week and it takes almost no time to have very hot water when I turn it back on.
You can make sure your supply knob on the back of the water heater is fully open. If it is partially closed (typically for colder incoming water), it will keep the water in the heating element longer. If it is wide open, you will let the water flow as fast as it can through the heat exchanger.
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11-16-2020, 03:08 PM
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#7
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Senior Member
Brand: Thor Motor Coach
Model: challenger 37FH
State: Delaware
Posts: 695
THOR #13399
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I think you're right about incoming water temperature,I checked the flow regulator knob yesterday and I'm pretty sure it's fully oopen,but I couldn't move it,didn't want to break it, sprayed with wd40 no luck. I'm going to try again tomorrow. Thanks again.
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11-16-2020, 08:17 PM
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#8
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Senior Member
Brand: Thor Motor Coach
Model: Four Winds 31W
State: Michigan
Posts: 542
THOR #9522
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I have seen the problem too when it's hot and the Girard was on the sunny side of the coach.
Pete
Ps. It's 43 in Detroit sure wish I was in they keys!
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Pete and Carolynn Foss from Oxford, MI
2018 Four Winds 31W
1999 Aero Cub F-21 trailer
1977 Tioga 24 foot RV
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11-17-2020, 02:40 PM
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#9
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Senior Member
Brand: Thor Motor Coach
Model: challenger 37FH
State: Delaware
Posts: 695
THOR #13399
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11-21-2020, 10:16 PM
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#10
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Member
Brand: Thor Motor Coach
Model: Citation SR24
State: Florida
Posts: 32
THOR #13811
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I called Gerard for this very same issue. It’s the incoming water temp. Mine will go to 118 degrees during summer months in Fla. I hate the unit overall but unfortunately it’s too difficult to change. You see they have a water heater and build an entire coach around it.
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11-21-2020, 10:24 PM
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#11
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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Quote:
Originally Posted by BobFla
I called Gerard for this very same issue. It’s the incoming water temp. Mine will go to 118 degrees during summer months in Fla. I hate the unit overall but unfortunately it’s too difficult to change. You see they have a water heater and build an entire coach around it.
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You would find it pretty easy to slip a Truma in it's place...
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11-22-2020, 02:01 PM
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#12
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Senior Member
Brand: Thor Motor Coach
Model: challenger 37FH
State: Delaware
Posts: 695
THOR #13399
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I have found a work around ,I run the water pump while showering I think it adds some cooler water from the tank and keeps the pressure up so I can add cold water with the handle without losing pressure and the heater kicking off. Plus seeing how I added the shower miser valve for boon docking,If the heater does kick off I can flip the valve until warm again then flip the valve back to shower,and when I'm done I use the valve to refill the tank.
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11-22-2020, 02:03 PM
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#13
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Member
Brand: Thor Motor Coach
Model: Quantrum RC25
State: California
Posts: 66
THOR #14016
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We replaced ours with a 6 gallon DSI gas and electric. No cutting required. Replaced water heater, door with trim, switch with gas and electric on/off. Hot water service just like home.
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11-23-2020, 03:02 AM
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#14
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Member
Brand: Thor Motor Coach
State: California
Posts: 59
THOR #19337
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heater temp
WE also have the Girard. Set to 107, once or twice it ran up to ~124 degrees. At other times we've been in the desert with temps above 100 and had no issue.
I've considered changing it but it works for a while, and I hate the cost of a new water heater. But it is very frustrating.
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