Question: Warning, solutions may have been lost

I've been trying to solve eqn1,eqn2,eqn3,eqn4 for T[water],T[air],T[Al],T[plastic] by using the defined variables listed above the set of eqn's, but everytime I get the "Warning, solutions may have been lost". Is there a solution to this or are the eqn's unsolvable?

> restart;
>
> h[infinity] := K[infinity]*(0.37e-1*RE[infinity]^(4/5)-871)*Pr[infinity]^3/L[plastic]:
> h[plastic] := N[plastic]*K[plastic]/L[plastic]:
> h[water] := .54*(T[water]/L[tray]-T[air]/L[tray])^(1/4):
> h[tray] := .27*(T[water]/L[tray]-T[air]/L[tray])^(1/4):
> h[Al] := N[Al]*K[Al]/L[Al]:
> Pr[infinity] := mu[infinity]*Cp[infinity]/K[infinity]:
> Pr[air] := mu[air]*Cp[air]/K[air]:
> RE[infinity] := L[plastic]*v[infinity]*rho[infinity]/mu[infinity]:
> Ra[plastic] := Pr[air]*L[plastic]^3*rho[air]^2*g*cos(theta[plastic])*(T[plastic]-T[air])*beta[plastic]/mu[air]^2:
> N[plastic] := (.825+.387*Ra[plastic]^(1/6)/(1+(.492/Pr[air])^(9/16))^(8/27))^2:
> beta[plastic] := (T[plastic]+T[air])/2:
> beta[Al] := (T[Al]+T[air])/2:
> Ra[Al] := Pr[air]*L[Al]^3*rho[air]^2*g*cos(theta[Al])*(T[Al]-T[air])*beta[Al]/mu[air]^2:
> N[Al] := (.825+(.387*Ra[Al]^(1/6)/(1+(.492/Pr[air])^(9/16))^(8/27)))^2:
> eqn1:= q[solar] = q[evaporation]+A[water]*epsilon[plastic]*sigma*(T[water]^4-T[plastic]^4)+(2*(h[water]*A[water]+h[tray]*A[tray]))*(T[water]-T[air])+epsilon[Al]*sigma*A[Al]*(T[water]^4-T[Al]^4):
> eqn2 := (2*(h[water]*A[water]+h[tray]*A[tray]))*(T[water]-T[air])=h[Al]*A[Al]*(T[air]-T[Al])+h[plastic]*A[plastic]*(T[air]-T[plastic]):
> eqn3 := q[condensedAl]+A[tray]*epsilon[Al]*sigma*(T[water]^4-T[air]^4)+h[Al]*A[Al]*(T[air]-T[Al])=K[Al]*A[Al]*(T[Al]-T[ground])/L[Al]:
> eqn4 := A[plastic]*epsilon[plastic]*sigma*(T[plastic]^4-T[infinity]^4)+h[infinity]*A[plastic]*(T[plastic]-T[infinity]) =q[condensedplastic]+h[plastic]*A[plastic]*(T[air]-T[plastic])+A[plastic]*epsilon[plastic]*sigma*(T[water]^4-T[plastic]^4):
>
> solve({eqn1,eqn2,eqn3,eqn4},{T[water],T[air],T[plastic],T[Al]});
Warning, solutions may have been lost